explain xkcd - User contributions [en]

10: Pi Equals

2023-09-18T16:17:46Z

LostXOR: Rewrote some stuff about pi to be more concise

{{comic
| number = 10
| date = September 30, 2005
| title = Pi Equals
| before = <big><big>[https://web.archive.org/web/20070927001941/http://xkcd-drawings.livejournal.com/?skip=40#:~:text=8%3A44%20pm-,Pi%20equals,-(4%20Comments Original title]: '''Pi equals'''</big></big>
| image = pi.jpg
| titletext = My most famous drawing, and one of the first I did for the site
}}

==Explanation==
This was the eleventh comic originally posted to [[LiveJournal]]. The previous one was [[9: Serenity is coming out tomorrow]], and the next one was [[14: Copyright]]. It was among the [[:Category:First day on LiveJournal|first thirteen comics]] posted to LiveJournal within 12 minutes on September 30, 2005, on the first day of the xkcd LiveJournal account.

There are two possible references here. One is from the book ''{{w|Contact (novel)|Contact}}'' by Carl Sagan, where the existence of God was shown in the last chapter to be encoded in the digits of {{w|pi}}. The other is an old joke of a {{w|Fortune cookie|fortune cookie}} with a fortune that reads, "Help! I'm trapped in a fortune cookie factory!" Similar jokes are often repeated for any mass-manufactured personalized item, often implying that the worker who made the item is working in a sweatshop somewhere or is literally trapped inside a factory and calling for help via the items they produce. This joke is also referenced in [[327: Exploits of a Mom]]'s title text, where [[Mrs. Roberts]]' [[Help I'm trapped in a driver's license factory Elaine Roberts|daughter]]'s name is "Help I'm trapped in a driver's license factory." The most literal interpretation of the joke would be that some being who helped to create the universe in a "universe factory" snuck a message into the digits of pi, asking for help to get out. Mathematical concepts being manufactured in a factory is the main mental image here. One can't help but wonder if the [http://static.tvtropes.org/pmwiki/pub/images/TimeBandits.jpg primordial beings who labored on the universe] to produce things like the gravitational constant and pi have a labor union. Judging by the fact that they're calling for help, it seems they don't.

Since pi is irrational (it has an infinite, non-repeating decimal representation), if each number pair were assigned a letter from the alphabet, or if it was converted to base-26, ASCII, or some other encoding, the entire works of Shakespeare, as well as any other expressible piece of information, including the message in this comic, could presumably be found. It is not really ''known'' that pi really has {{w|normal number|this property}}, but the absence of this property would in itself be an extraordinary coincidence. However, the probability of finding any given string of numbers within a calculable range of digits of pi [http://www.angio.net/pi/whynotpi.html diminishes rapidly as the string length increases].

In the novel {{w|Contact (novel)|Contact}} by {{w|Carl Sagan}}, he includes a "[https://web.archive.org/web/20180801055937/http://goddoesnt.blogspot.com:80/2013/10/pi-and-signature-of-god-from-carl.html Signature of God]." In brief, the signature consists of a very long string of 1s and 0s far out (after some 10^20 seemingly random numbers) in the base-11 expansion of pi that when arranged in a square of a specific size yields a clear drawing of a circle with a diameter of several hundred digits. The existence of this pattern was hinted to the protagonist by a member of an advanced alien civilization as being encoded in physics by an even more advanced civilization with the ability to create universes. Interestingly enough, this could also work for pictures: if you assign a set of nine numbers to equal an RGB hexadecimal color value, eventually you will find the Mona Lisa.

In the book ''[[xkcd: volume 0]]'', this comic has a red text at the bottom of the page: CNEG BAR BS RVTUG VA URK: RR AVAR RVTUG SVIR BAR BAR RVTUG. It's ROT13 for "PART ONE OF EIGHT IN HEX: EE NINE EIGHT FIVE ONE ONE EIGHT". "7108914" appears in position 13,709,690 of pi, suggesting that the length of the string of "digits" that is 'helpimtrappedinauniversefactory' is correspondent to a good 13,709,675 digits long, meaning each individual letter corresponds to about 456989.166667 digits. Aggravatingly, however, if the string was instead "71089314", it would appear at position 2533.
* If the letters correspond to the phone keypad, then these digits are wrong: 3.14159265358979343574687277334628648377332286797108914
* If the words correspond to their length, then these digits are wrong: 3.14159265358979342721877108914
* And if the words are omitted altogether, then these digits are wrong: 3.1415926535897937108914

In the title text, [[Randall]] notes that this is one of his first drawings and it became one of his most famous comics. At the time, it was re-released on [https://xkcd.com xkcd.com] on January 1, 2006, with the number 10, but it was the eleventh comic posted to LiveJournal. See the [[#Trivia|trivia section]] below. In ''xkcd: volume 0'', this comic has a different title text: "I've put rescue instructions in e. You'll need the cheat codes for your universe, which I hid in the square root of two.".

==Transcript==
:[A huge π to the left, then a large equal-to sign, and then five rows of text.]
:<big><big><big>π</big></big></big> = 3.14159265
::3589793help
::imtrappedin
::auniversefac
::tory7108914...

==Trivia==
* [[36: Scientists]] was initially published as a duplicate of this comic. Over three months after the original posting, Randall noticed the error and corrected it sometime between [http://web.archive.org/web/20060423175703/http://www.xkcd.com/c36.html April 23, 2006] and [http://web.archive.org/web/20060705231511/http://xkcd.com/c36.html July 5, 2006], when the updated version appeared in the Web Archive. He likely found an old drawing that was never meant for publication and used it instead, so it wouldn't appear out of place among the other comics from that period. This is why [[36: Scientists]] [[:Category:No date|doesn't have a date]] like most other comics.
* This used to be one of the [[Footer comics|footer comics]] featured in the bottom segment of [https://xkcd.com xkcd.com].

{{comic discussion}}

[[Category:Posted on LiveJournal| 11]]
[[Category:First day on LiveJournal| 11]]
[[Category:First day on xkcd.com]]
[[Category:Checkered paper]]
[[Category:Math]]
[[Category:Footer comics]] 
[[Category:Comics with lowercase text]]

4: Landscape (sketch)

2023-09-18T15:13:44Z

LostXOR: More detailed explanation of title text

{{comic
| number = 4
| date = September 30, 2005
| title = Landscape (sketch)
| before = <big><big>[https://web.archive.org/web/20070927001941/http://xkcd-drawings.livejournal.com/?skip=40#:~:text=8%3A35%20pm-,Landscape,-Don%27t%20ask%20me Original title]: '''Landscape'''</big></big>
| image = landscape_cropped_(1).jpg
| titletext = There's a river flowing through the ocean [https://web.archive.org/web/20070927001941/http://xkcd-drawings.livejournal.com/?skip=40#:~:text=8%3A35%20pm-,Landscape,-Don%27t%20ask%20me Original caption]: Don't ask me why there's a river running through the ocean. Please.
}}

==Explanation==
This was the second comic originally posted to [[LiveJournal]]. The previous one was [[7: Girl sleeping (Sketch -- 11th grade Spanish class)]], and the next one was [[3: Island (sketch)]]. It was among the [[:Category:First day on LiveJournal|first thirteen comics]] posted to LiveJournal within 12 minutes on September 30, 2005, on the first day of the xkcd LiveJournal account.

[[File:Flipped sketch.jpg|thumb|Flipped sketch]]
This comic does not present a particular point, it's just a picture drawn by Randall. The sketch, when flipped vertically, maintains the appearance of having the sea on the bottom and sky on top, although the setting sun is on the wrong part of the horizon. Similar to {{w|Relativity (M. C. Escher) | works of M. C. Escher}}, this picture takes visual components of a typical scene and combines then in ways that appear to work well on a small scale, but would never combine that way in real life and do not make sense in the larger context of the image. The clouds are casting shadows on the sky.

In the title text, Randall jokes that there is a river flowing through the ocean. The lighter part in the center of the drawing could be interpreted as a river. Since the darker part is the ocean, it doesn't make much sense for there to be a river.

==Transcript==
:[A sketch of a landscape with sun on the horizon.]
:[There is text from the checkered paper at the top:]
:From Page No.__

{{comic discussion}}

[[Category:Posted on LiveJournal| 02]]
[[Category:First day on LiveJournal| 02]]
[[Category:First day on xkcd.com]]
[[Category:Checkered paper]]
[[Category:Sketches]]
[[Category:Comics with lowercase text]]

2083: Laptop Issues

2023-05-23T19:44:48Z

LostXOR: Removed "that should be kept"

{{comic
| number = 2083
| date = December 10, 2018
| title = Laptop Issues
| image = laptop_issues.png
| titletext = Hang on, we got a call from the feds. They say we can do whatever with him, but the EPA doesn't want that laptop in the ocean. They're sending a team.
}}

==Explanation==
[[Cueball]] goes to tech support with his laptop. [[Hairy]] and [[Ponytail]] are waiting behind the counter; one has dealt with [[:Category:Cueball Computer Problems|Cueball's bizarre tech issues]] before, and warns the other. Sure enough, Cueball sets the computer down and offers a detailed list of the arcane problems his computer is giving him.

; ''"My laptop's battery won't hold a charge."''
: A common problem; most laptops use {{w|Lithium-ion battery|lithium ion}} batteries due to their high power to weight ratio. Whilst the charge storage capacity of all batteries decreases over repeated charging and discharging cycles, lithium ion batteries are particularly prone to degradation over time. This is because charge is stored by lithium ions {{w|Intercalation (chemistry)|intercalated}} between layers of a 2D metal oxide material. When the battery is discharged the lithium ions move out of the metal oxide layers, allowing the material to contract, and it is this mechanical expansion and contraction of the material over repeated charging cycles that damages the battery, reducing storage capacity. However...

; ''"Tried [replacing the battery]. Now the new ones won't either."''
: ...the problem persisting despite the battery's replacement fails to make any significant sense. It may be a problem with his laptop's charging port, but his comment that the "new ones" now fail to hold a charge seems to imply it is persisting despite the replacement batteries being used elsewhere after attempting to use them for his laptop and failing... Many modern batteries have firmware built in now that reports their charge level. It is possible that his laptop is installing a faulty firmware to any batteries that get connected. Alternatively, an electrical fault within the laptop may be shorting the battery, leading to high currents which damage the battery.

; ''"Also, random files get corrupted on the first of every month."''
: Some devices may be scheduled to do a "{{w|disk cleanup}}" on the first of every month. Somehow, this task is corrupting random files.

; ''"Factory reset didn't help."''
: A {{w|factory reset}} of a device deletes all files, undoes all customizations, and generally puts the system back to square one. Under normal circumstances, this is an effective last-resort measure for dealing with glitches, viruses, and malware, so the fact that it doesn't offer any help suggests that the device's factory settings were already corrupt when they were first made or that the problem is hardware-related, although the typical hardware issues would tend to occur at random times and not be dependent on the calendar. External factors are likely here, such as visiting somewhere highly magnetic monthly. That or the people who coded the factory reset made improper assumptions about what is unchangeable and should not be checked; most Android factory resets won't fix a botched rooting, for instance, because low-level binary executables shouldn't need resetting, right? Nobody should be able to knacker that deep (although Cueball apparently just did).

; ''"When it's plugged in, I get static shocks from my plumbing."''
: {{w|Static discharge}} from a portable device while it's charging is common. Static charge on other items in the building is not. However, plumbing systems on older houses were often used to provide a ground instead of using grounding rods, which are now the accepted norm. This could imply that Cueball's house is old, and for some reason his laptop is pumping a large amount of charge directly to ground.

; ''"And it reboots if someone uses an arc welder nearby."''
: The high power draw of an {{w|arc welder}} will occasionally cause less devoted power supplies to flicker. Coupled with the bad battery that cannot keep the computer running when the power dips, this might cause his laptop to reboot. This could also be just because the arc welder is causing a large amount of electromagnetic interference.

; ''"Transitions® lenses go dark when exposed to the screen,"''
: {{w|Photochromic lenses}} (commonly known by the brand name Transitions® lenses) in prescription glasses darken when exposed directly to UV rays; this is to avoid the wearer any hassle of needing prescription {{w|sunglasses}}. This seems to indicate that the screen of Cueball's laptop is emitting UV radiation. Whilst {{w|Cathode-ray tube}} (CRT) monitors can emit small amounts of UV light and X-rays, most laptops use either {{w|Liquid-crystal display|Liquid-crystal}} or {{w|OLED}} displays which do not emit significant amounts of UV-light, and would not be expected to cause photochromic lenses to darken. Most displays would also be expected to contain a filter to block any harmful UV-light from damaging the eyes of the user. Since UV-light is very damaging to the eyes, a screen that emits sufficient UV-light to darken sunglasses would be hazardous to look at.

[[File:Film Fogging due to X-Rays.tif|thumb|180px|Film fogging due to x-rays]]
; ''"and when I open too many tabs, it fogs nearby photographic film."''
: {{w|Photographic film}} used in old analogue (not digital) cameras contains light-sensitive chemicals which change from transparent to opaque when exposed to light. The photographic film '{{w|Negative (photography)|negatives}}' are then printed onto paper, inverting the colors (i.e. areas that appear dark on the film appear bright on the print, as they do in real life). If photographic film is exposed to light, either intentionally or unintentionally (such as by accidentally opening the back of the camera whilst the film is unwound) then the film will become over-exposed, leading to a bright 'fog' that obscures the image. Fogging can also occur as a result of chemical degradation of the film or by exposure to radiation sources including X-rays. In order to cause fogging, the screen would have to be emitting X-rays that can pass through the film's container and expose the film. It is unclear why this should only occur when too many tabs are opened. Combined with the previous statement this indicates that a worrying range of light being emitted by the screen.

The sheer incongruity of everything Cueball has reported, in combination with past issues, leads Hairy to report that his manager has authorized Cueball and his laptop be thrown into the ocean. Cueball accepts this without objection. This is a reference to [[1912: Thermostat]], where Cueball has an issue with his thermostat, and the Tech support employee asks him if he has tried walking into the sea. It seems this suggestion has evolved into forcefully throwing him into the sea, for lack of a better idea. It could also be that this is a reference back to the first of the series of comics on Cueball's many [[:Category:Cueball Computer Problems|computer problems]], [[349: Success]], where he ended up in the ocean. Alternatively, it seems very similar to the account of Jonah in the Bible, who was thrown overboard into the ocean during a violent storm after which the storm ceased.

The title text contains mention of the {{w|Environmental Protection Agency}} (EPA), a part of the United States government responsible for preventing pollution. In real life, most of a laptop computer's components are considered toxic waste, and the EPA, as part of their mission, would not want it dumped in the ocean. More to the point, it's implied that whatever Cueball did to it renders it far more dangerous than an ordinary laptop, and the EPA ''really'' doesn't want his cursed possessions in the ocean; thus they are sending a {{w|Dangerous goods | hazmat}} team to collect the laptop and safely dispose of it. However, in the comic, the EPA do not seem to be bothered with Cueball himself being thrown into the ocean.

==Transcript==

:[Cueball, carrying a laptop, is walking past a sign with a right-pointing arrow reading "Tech Support".]
:Off panel voice #1: ''Oh no.''
:Off panel voice #2: ''What?''
:Off panel voice #1: ''This guy. He has the worst tech problems.''

:[Cueball standing at a tech support desk with an open laptop facing Hairy and Ponytail on the other side of the desk.]
:Cueball: My laptop's battery won't hold a charge.
:Hairy: We can replace it.
:Cueball: Tried that. Now the new ones won't either.

:[Close-up of Cueball gesturing with left hand]
:Cueball: Also, random files get corrupted on the first day of every month. Factory reset didn't help.
:Off panel voice: ''You weren't kidding.''

:[Close-up of Cueball with right hand on chin, gesturing with left hand]
:Cueball: When it's plugged in, I get static shocks from my plumbing.
:Off panel voice: What the...
:Cueball: And it reboots if someone uses an arc welder nearby.

:[Same tableau as second panel except that the laptop is slightly closed now.]
:Cueball: Transitions® lenses go dark when exposed to the screen, and when I open too many tabs, it fogs nearby photographic film.
:Hairy: We don't usually do this, but I've gotten permission from my manager to have you and the laptop hurled into the ocean.
:Cueball: That's probably for the best.

{{comic discussion}}

[[Category:Cueball Computer Problems]]
[[Category:Computers]]
[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Hairy]]
[[Category:Comics featuring Ponytail]]

1931: Virtual Assistant

2023-05-22T19:58:14Z

LostXOR: Replaced dead audio link with a YouTube video link

{{comic
| number = 1931
| date = December 20, 2017
| title = Virtual Assistant
| image = virtual_assistant.png
| titletext = If you ask it to please turn off that feature, it apologizes a whole bunch and promises to try to be quieter, then switches to a slightly lower-volume version of the clip with "sorry!" after the louder sounds.
}}

==Explanation==
[[Megan]] invokes her smart device's virtual assistant with the phrase "Ok Google", intending to follow up with a voice command (e.g., "Check the weather forecast" or [[1807: Listening|"Order two tons of creamed corn"]]). But before she can continue, the smart device interrupts her with a comical cacophony of assorted noises, as a supposed assistant living in the device clumsily rushes from a distant room to Megan's location. The sounds can be interpreted as: tromping down stairwells, knocking over a fragile antique, opening a locked door, taking a quick pit stop in the bathroom, going back through the door, running across another hardwood floor, opening, and slamming another door, and finally running up to Megan, greeting her while clearly being out of breath.

The idea of a product that is (in reality) a virtual assistant{{Citation needed}} being an actual person with physical form was featured a few days before this comic on ''{{w|Live from Here}}'' on December 16, 2017, in a segment in which Amazon.com and its virtual assistant Alexa were satirized as "Amazon Lazy", which delivered the user things that were already in the user's home -- or simply carried the user from one room of the house to another. (Video [https://youtu.be/HFl0ocf4mSM here])

[[Randall]] is amused by the idea that such a "virtual" assistant made "real" might be rather clumsy. In fact, Randall finds the concept so humorous that he would like to troll smart device owners by hacking and re-programming their devices to play this sound file whenever the VA is invoked. He makes it clear that he doesn't want to create a {{w|botnet}} with them, perhaps in reference to the infamous [[wikipedia:Mirai_(malware)|Mirai]] attacks of 2016, whose creators pled guilty in court a week before the comic was posted. Another similar activity that is gaining popularity is hacking IP webcams with embedded speakers for comedic purposes (here's a [https://www.youtube.com/channel/UCQOvNer68CxTszlWcscbIWQ YouTube channel]).

The title text extends the concept further. If the owner attempts to disable the feature, rather than refrain from playing the clip, the virtual assistant apologetically promises to be quieter next time; thereafter, the device plays a modified version of the clip where the noises are only slightly diminished and punctuated with additional apologies from the live-in assistant. Randall has characterized the assistant as being incapable of answering without causing a ruckus.

A previous comic, [[1897: Self Driving]], also toys with the idea that AI is actually just people behind-the-scenes. Sounds of things falling over and breaking off-screen is a {{tvtropes|OffscreenCrash|comedic trope}} used in movies. The idea of making it look as if excessive work is put in to being ready to answer the user may be a reference to the Monty Python "it's" man.

==Transcript==

:[Megan stands next to a small table with a Google Home sitting on it.]
:Megan: Ok, Google–
:Google Home: THUMP-THUMP-THUMP
:Google Home: CRASH  THUD!
:Google Home: CLICK  THUMP THUMP
:Google Home: [sink running]
:Google Home: ZIIIIIP!  CLICK
:Google Home: THUMP THUMP  CLICK
:Google Home: SLAM!
:Google Home: THUMPATHUMPATHUMPA
:Google Home: H... ''*Pant*'' ...Hello... ''*Pant*''
:Google Home: How... How can I help you?

:[Text below the panel:]
:I want to hack the world's smart home devices, but not to create a botnet or anything—I just want to make them play this sound clip every time you invoke them.

{{comic discussion}}

[[Category:Comics featuring Megan]]
[[Category:Virtual Assistants]]

1797: Stardew Valley

2023-05-19T20:04:02Z

LostXOR: period instead of exclamation point

{{comic
| number = 1797
| date = February 10, 2017
| title = Stardew Valley
| image = stardew_valley.png
| titletext = I have accidentally watered virtually every person and object in Pelican Town.
}}

== Explanation ==
''{{w|Stardew Valley}}'' is an indie {{w|farming}} {{w|simulation}} role-playing {{w|video game}} created and published by {{w|Eric Barone (developer)|Eric Barone}}. Just as in similar games like {{w|Farmville}} and {{w|Harvest Moon (series)|Harvest Moon}}, the player takes the role of a {{w|farmer}} who establishes their own farm and performs everyday tasks such as watering {{w|plants}}, growing food, and tending to animals. ''Pelican Town'', referenced in the title text, is a fictional village in this game.

In this comic, Cueball begins his morning routine in a ''Stardew Valley'' session by waking up and watering some of his farm's plants. However, he then walks up to a sleeping cat, pauses for a moment, then pours water on it, startling it awake. He says "Dammit." to this, likely indicating this isn't the first time he's made this mistake.

In the game, watering plants is an essential chore, which requires the player to "equip" a watering can. The player moves their character up to a plant and simply presses an action button (or key) to perform the watering action. The same action button is used to interact in different ways with other things, animals and people (e.g. to talk to them), so accidentally leaving the watering can equipped while trying to talk to someone can cause the player to "water" them instead. The comic illustrates how easy it is to do this in the game, as well as the comedic value of seeing this happen from the point of view of the player's character.

The title text reinforces this humor by indicating that [[Randall]] has used the watering can, probably unintentionally, on nearly every person and object in the game. It's amusing to think that he may curse each time he realizes he's still holding the can when he tries to talk to someone. (His use of the word "Dammit" in this comic also calls to mind a brief discussion on the word in [[559: No Pun Intended]].)

The use of the word "virtually" in the title text plays with the word's double meaning. It is used here in the sense of "almost", however when swapping the words "virtually" and "waters", the word assumes its alternate meaning, but the title text still makes sense: Since the game is only a simulation, the player "virtually waters" his plants.

''Stardew Valley'' was also mentioned only two weeks prior to this comic in [[1790: Sad]]; this comic explains why.

Interestingly, this comic is drawn in a slightly unusual style for [[xkcd]]. Of note is the border around the caption ("Stardew Valley Morning Routine"), the thicker-than-normal penmanship, and the use of drawn borders around the watering sound effects, Cueball's yawn, and the cat's sleeping word balloon. The cat's balloon in particular follows the visual style of the game (in which certain objects and animals may show their current emotional states with word balloons) - more generally, actions that normally occur in the game, such as the yawn and the watering action, appear to be shown in balloons while Cueball's "Dammit!" is written in the style of other xkcd comics. This likely suggests that Cueball's epithet here represents the player (Randall) actually saying this in response to the incorrect action of his character in the game.

== Transcript ==
:[Inside a slim frame at the top of the comic there is a caption:]
:Stardew Valley morning routine

:[Below this frame there are two rows each consisting of three small panels taking up the same width as the caption panel above:]

:[Cueball wakes and rises up from his pillow sitting beneath his blanket in his four poster bed with round knobs. He yawns with a hand to his mouth. Above him floats a large sound bubble:]
:Cueball: '''''Yawn'''''

:[Cueball walks to the right with a small watering can held in front of him.]

:[Cueball pours water from the can over the three small plants. A line goes from the water to another bubble:]
:Water: ''Splish''

:[Cueball walks back to the left with the watering can.]

:[Cueball stops with the can right next to a sleeping cat, which has a speech bubble pointing to its head.]
:Cat: Z

:[Cueball proceeds to pour water on the cat which immediately jumps up away from him trying to escape as water cascades on it. Again there is a line from the water to a speech bubble, but both the cats angry sound and Cueball's comment is written without bubbles.]
:Water: ''Splish''
:Cat: ''Mrowl!!''
:Cueball: '''''–Dammit. '''''

{{comic discussion}}

[[Category:Comics featuring Cueball]]
[[Category:Video games]]
[[Category:Cats]]

1678: Recent Searches

2023-05-17T17:42:27Z

LostXOR: Changing CPU jumpers would probably cause a crash or physical damage

{{comic
| number = 1678
| date = May 9, 2016
| title = Recent Searches
| image = recent_searches.png
| titletext = autoexec code posted by verified twitter users
}}

==Explanation==
People often find answers to computer problems by searching on {{w|Google}}, which attempts to guess your intended search term based on your location, language and the characters you've already typed, placing its suggestions in a drop-down box beneath the input area. If the search box is clicked on but nothing is typed, the drop-down box by default shows a list of your most recent searches.

Here we see a list of search queries, each of which suggests the author is perversely misusing or overextending some computer technology. The overall impression is of someone technically sophisticated enough to shoot themselves in the foot, and who does not learn any larger lessons despite doing so repeatedly. The title text is another possible entry in this list.

The caption implies that from Randall's perspective, every computer he uses seems to be broken; he doesn't seem to realize this is because he's the one using them, not because the computers actually start off broken. (For similar themes see also these comics: [[349: Success]], [[1084: Server Problem]], [[1316: Inexplicable]] and [[1586: Keyboard Problems]]).

([[979|Dear people from the future]], if Google directed you here because it is the most popular result for a problem you are experiencing, this is not the page you were looking for).

===List of searches===
; [https://www.google.com/search?q=Google+translate+syntax+highlighting Google translate syntax highlighting]
: {{w|Syntax highlighting}} can be used when editing {{w|source code}} to make the code more readable and easier to understand. It is not generally used for natural languages, but {{w|sentence diagram}}s of brief passages are used in language education. {{w|Google Translate}} is used to translate text from one {{w|natural language}} to another. It uses {{w|JavaScript}} <tt>mouseover()</tt> to highlight words as an aid in matching phrases in the source with their translations, but does not apply different highlighting dependent on syntax.
:Alternatively, this could imply that Randall is attempting to translate code from one programming language to another using Google Translate. Success would be unlikely, since the service is not intended for this {{Citation needed}}, and syntactically valid output might further break the computer executing it.
:Two other possible interpretations of this phrase are that Randall wants to translate the phrase "syntax highlighting" to another language, or that he wants to perform syntax highlighting on the source code for Google Translate.
; Autodetect mixed bash zsh
: {{w|Bash (Unix shell)|Bash}} and {{w|Z_shell|Zsh}} are two {{w|Command-line_interface|command line interfaces}} for {{w|Unix-like}} OSes. The way to execute commands is almost identical, making detecting a script that contains a mixed syntax nearly impossible. This was later referenced in [[2510: Modern Tools]].
; CPU temperature sensor limits
: The CPU's temperature sensors exist to tell you when your CPU is becoming dangerously overheated (normally because of a faulty fan or overclocking). Someone who searches for information about the limits of those sensors is presumably expecting to misuse their CPU. Probably also a reference to [[1172: Workflow]].
; GIF to XLS
: .GIF (Graphic Interchange Format) is a file extension used to store images and sequences of images to be displayed as an animation. .XLS is the file extension for Microsoft Excel spreadsheets. The joke is that the two file types are used for different purposes - it's quite normal for someone to want to convert between .GIF, .JPG, .PNG, .BMP files, as these are all image files; or between .XLS, .CSV, and .ODS files, as these all record tabulated information. However, for some reason Randall wants to convert an image file to a spreadsheet. (This is actually possible, because a digital image is essentially an array of color and brightness values; it just wouldn't be particularly useful for most people. [http://www.think-maths.co.uk/spreadsheet Here] is a webpage with an online converter.) Matt Parker has done a [https://www.youtube.com/watch?v=UBX2QQHlQ_I stand up routine] about converting these two file types.
:An alternate way to convert an image file, such as a .GIF file, into a text-based file like an .XLS file, is through {{w|optical character recognition}} (OCR). This is only effective if the image is a copy (i.e. a scan or reasonably clear photograph) of a document containing letters and words, and neither .GIF nor .XLS are file formats anyone would usually use in that case.
; Clock speed jumper sample rate
: A jumper is an intentional short circuit used for selecting options for an electronic circuit. They are usually used where it is not feasible to use programming (such as outputting a byte or word through a port) to alter the selection, such as before the processor even begins executing. A common example would be, on some motherboards, jumpers can be used to alter the clock speeds of various motherboard functions (such as the CPU or the front side bus). These jumpers should ordinarily be modified when the computer is off. However, this search is asking how often the motherboard checks the status of the clock speed jumpers, implying that they intend to change these jumpers while the computer is powered on, and often enough that the sample rate matters (change CPU speed several times a second, by moving jumpers on the motherboard.). This would likely make the computer crash, or worse, cause physical damage to its components.
; [https://www.google.com/search?q=clean+reinstall+keybinding Clean reinstall keybinding]
: This refers to keybinding, the practice of mapping (binding) a certain key to a certain function (e.g., pressing PRTSC will take a screenshot). Most keyboards do not output characters directly, but only codes for which keys have been pressed (or released). Keybindings translate the pressing of the "A" key on your keyboard into the letter "A" being sent to a program which is reading keyboard input. A "clean reinstall" of keybindings is something that would almost never be necessary - it means Randall has modified his default keybindings to such an extent that his [[1031:_s/keyboard/leopard/|leopard]] has become unusable (similar to [[1284: Improved Keyboard]]), necessitating a "clean reinstall" of the bindings. Alternatively, he might be doing clean reinstalls so often that he wants a keybinding to execute them with minimal loss of time.
; Cron job to update crontab
: {{w|Cron}} is a utility on most Unix-like OSes that allows you to schedule commands or scripts to be run periodically. These scheduled jobs are read from a ''crontab'' file. A job that updates the crontab (therefore creating new jobs, removing old ones or editing existing ones) is paramount to a {{w|job scheduler}}, and trying to use cron for such functionality could result in highly unstable functionality (although a crontab could be sensibly regenerated periodically by a set of machines from a master crontab file annotated with per-host directives). This is similar to {{w|self-modifying code}}.
; [https://www.google.com/search?q=fsck+chrome+extension fsck Chrome extension]
: This is a search for an interface to the Unix '''f'''ile'''s'''ystem che'''ck'''er {{w|fsck}} via third-party software added to Chrome. fsck is a program for checking your filesystem for corruption. Repairing a filesystem this way would be inadvisable. {{Citation needed}} This might indicate confusion about the meaning of the term "online filesystem repair", in which "online" means "while the filesystem is in use" rather than "over the Internet". Alternatively, Randall might want to repair an installation of the operating system Chromium, in a manner less drastic than the {{w|factory reset}} preferred by Google.
; Recursive font
: An idiosyncratic mix of {{w|recursion}} and the font style ''{{w|cursive}}'', referring especially to text handwritten in a flowing manner. {{w|PostScript}} (the language in which {{w|PostScript fonts|some fonts}} are written) is capable of recursion and PostScript Type 3 fonts are able to use the full language. This could create effects like fonts with complicated fractal borders and fill patterns - but the increase in processing time would contribute to seeming brokenness of the computer (or printer) rendering the font.
:A true recursive font would be a form of {{w|fractal}}s ([http://blog.matthen.com/post/5340546486/first-sketches-in-mathematica-for-a-new-font-it example]).
; Regex matching valid EBNF
: EBNF refers to {{w|Extended Backus–Naur Form}}, which is used to define {{w|formal language}}s. EBNF specifies recursive patterns that are impossible for a {{w|Regular_Expression|regular expression}} (regex) to determine whether it is valid or not. There is some irony in using regex to test the validity of something which ''defines'' the validity of things like regex.
; [https://www.google.com/search?q=Hardlinks+Turing+complete Hardlinks Turing complete]
: In some file systems, for example {{w|ext4}} and {{w|NTFS}}, a single file may be referenced in multiple places in the file system. These filenames are termed "hard links" because the operating system automatically resolves them to the actual file. "Soft" or "symbolic" links are resolved indirectly via a pathname, which may reside anywhere. A file is considered deleted when the last hard link to it is unlinked; a soft link exists independently of its target. In fact, the target need not exist, in which case this is often called a dangling symbolic link.
:{{w|Turing completeness}} is the {{w|computational complexity}} required to simulate any {{w|computable function}} (given an infinite amount of memory). Recently there have been cases where [http://beza1e1.tuxen.de/articles/accidentally_turing_complete.html unexpected mechanisms] from card games to text parsers were proved to be Turing complete. Hardlinks being Turing complete would imply that creating and deleting hardlinks alone is enough to satisfy the requirements of Turing completeness.
; Opposite of safe mode
: {{w|Safe mode}} is a diagnostic mode in many operating systems and applications which allows the user to troubleshoot problems by disabling unnecessary functionality. The "opposite of safe mode" implies a "dangerous mode" where the purpose is to allow uselessly dangerous actions (in actuality this supposed dangerous mode is the default mode). A common example is the {{w|sudo}} command in Unix-like OSes, which grants the user system-level permissions.
:It's also possible that Randall sees Safe Mode so often that he sees regular mode as an unusual and unique state and needs help navigating back to it.
; Predictive touchpad
: {{w|Predictive text}} is a feature of many smartphone keyboards that predicts the most likely word the user wishes to type, and then gives the user the option to place the full word in the sentence immediately without having to finish typing it. A {{w|touchpad}} is a computer pointing device, similar to a {{w|computer mouse}}. The idea of a "predictive touchpad" seems absurd because, as opposed to typed words, there are not a limited number of swipe combinations that are possible on a touchpad. A "predictive touchpad" implies that a computer could predict where the user was going to move the mouse or click, which in this case would seem to defeat the purpose of a user input device. {{Citation needed}}.
:Interestingly, a version of Linux had a predictive cursor option, where the cursor jumped to the nearest button (like window close) when it moved near to but didn't quite reach that button.
; Google docs from bootloader
: A {{w|bootloader}} is a very small program that is usually the very first thing to execute when a computer boots up. It is used mainly for loading the operating system into memory. Such a program by itself would not be capable of directly running something as complex as {{w|Google Docs}}.
; Hardware acceleration red channel only
: {{w|Hardware acceleration}} means that certain calculations are not performed by the computer's {{w|CPU}} but by a "specialized" processor, e.g. a {{w|GPU}} which is part of the graphics adapter. This speeds up output, especially if complex 3D calculations are required, and reduces CPU load. To use this function only on a single color channel seems pretty useless, but one may want to troubleshoot a program that displays only red when hardware acceleration is enabled.
:While graphics cards are most commonly used with three or four channels (red, green, blue, and sometimes alpha), they do support two-channel or single-channel images. An 8-bit single-channel image would use the format '[https://www.opengl.org/wiki/Image_Load_Store#Format_qualifiers R8]', which is indeed 'red channel only'. This type of image could be used to store monochrome images or non-image data.
; autoexec code posted by verified twitter users. ('''Title text''')
: The term "autoexec" refers to code that runs automatically, usually during boot, and derives from one of three boot-time files for {{w|MS-DOS}}: AUTOEXEC.BAT, CONFIG.SYS and COMMAND.COM. AUTOEXEC.BAT would typically contain commands for customizing the command prompt, loading additional drivers, and/or automatically launching a program.
:Automatically executing code from the Internet is generally a terrible idea, because it could be written by someone with malicious intent and harm your computer. The joke here is that the code would only be executed if written by someone who has been "verified" on Twitter. Twitter's verification service (at the time the comic was made) only serves to show that a user is who they claim to be, not whether anything they say (or program) can be trusted, so this would provide little protection. Usually, Twitter verification is used by celebrities so they can be distinguished from people claiming to be them. The line implies that Randall is only interested in running code posted by celebrities.
:Most code downloaded from authentic sources (such as Microsoft and official Linux distributions) is verified by a cryptographic signature from a true trusted source, authenticating the origin of the software. These may include software updates that run automatically in the background. The joke here is that the term "verified" means very different things between Twitter users and software distribution.
:Additional hilarity was added to this by circumstances in 2022 when, after Elon Musk's takeover of the site, anyone could buy a visually identical verification symbol for $8. With a number of notable spoof/fake accounts being 'verified', it was potentially an even worse idea than it was in the first place — not that all genuinely verified users could be trusted to be unimpeachable in this regard.

==Transcript==
:[Colored and styled as the real logo:]
:GOOGLE

:[Google Search bar, with a drop down box with faded text, implying recent searches.]
:Google translate syntax highlighting
:Autodetect mixed bash zsh
:CPU temperature sensor limits
:GIF to XLS
:Clock speed jumper sample rate
:Clean reinstall keybinding
:Cron job to update crontab
:fsck Chrome extension
:Recursive font
:Regex matching valid EBNF
:Hardlinks Turing complete
:Opposite of safe mode
:Predictive touchpad
:Google docs from bootloader
:Hardware acceleration red channel only

:[Caption below the frame:]
:'''I have no idea why my computers are always broken.'''

{{comic discussion}}
[[Category:Comics with color]]
[[Category:Google Search]]

1590: The Source

2023-05-16T14:39:06Z

LostXOR: title text doesn't say on Earth

{{comic
| number = 1590
| date = October 14, 2015
| title = The Source
| image = the_source.png
| titletext = Why did we even have that thing?
}}

==Explanation==
This comic is about experiencing a high pitched hum in an empty room. An "empty-room hum" is a high pitched buzzing noise, often caused by {{w|tinnitus}}, which is a medical condition causing high-pitched noise when there is no other noise around. Tinnitus is normally a hearing condition, not a disease. It may result from the brain [http://wiki.answers.com/Q/What_is_the_high_pitched_humming_sound_often_heard_in_an_otherwise_empty_and_silent_room increasing its sensitivity to noises.]

Sometimes not everyone can hear "empty-room hum"; however, those who can hear it usually find it immensely annoying. If you do hear the noise, you would like to locate '''The Source''' – hence the title of the comic. Hopefully when you find the source, you can do something about it. Or if you don't find it, you can at least be at ease knowing that others experience the empty-room hum, it having been referenced in two xkcd comics now and [http://wiki.answers.com/Q/What_is_the_high_pitched_humming_sound_often_heard_in_an_otherwise_empty_and_silent_room elsewhere] on the internet.

This comic alludes to the perspective of an outside observer who doesn't hear the hum but is watching someone who can hear it: because the sound isn't written out in text, the comic reader at first is confused by Cueball's inexplicable searching.

In the first two frames of the comic we see [[Cueball]] trying to locate the direction of the sound, by standing in the middle of the room, turning his head from one to the other side. Finally he walks down a flight of stairs (probably to the basement) and here he locates the source: A machine whose only function is to generate a high pitched hum. The title text asks why they had such a machine in the first place, which is somewhat difficult to explain and likely the crux of the title text's joke.

Luckily it was thus easy for Cueball to get rid of this sound at the source. But in real life most electronics generate hums and cannot reasonably be turned off without losing functionality. For instance fluorescent lights, phone chargers and computer modems are common culprits, refrigerators and washing machines less commonly. It could also come from outside the house, in which case it will be much harder either to locate the source or to do anything about it. Power lines and transformers are common outside sources.

There do, however, exist devices that are meant to create a high pitched hum, that people might wish to install in their house. These will be humming in the {{w|ultrasound|ultrasonic}} regions, although cheap versions can often be heard by young people. They are typically used for {{w|Electronic_pest_control#Ultrasonic|electronic pest control}}, while slightly lower frequencies which can typically be heard only by young people are sometimes used to {{w|The Mosquito|repel children}}. It is possible that someone tried to get rid of Cueball.

There do exist {{w|white noise}} generators (which make equal volume noise on every frequency) and {{w|pink noise}} generators (which make noise that sounds equally loud to the human ear at every frequency) which are used to test recording studios to see if they have good sound quality. It seems unlikely that the device is one of these, as it seems to be designed to generate a high-pitched hum: pink/white noises are categorically and perceptually different from a hum.

The sound wave spectrum in [[273: Electromagnetic Spectrum]] also contains a line for "that high-pitched noise in empty rooms".

The empty white room also could be a reference to a scene from [https://en.wikipedia.org/wiki/The_Matrix_Reloaded The Matrix Reloaded] in which Neo searches for "The Source," though this is likely just a coincidence.

There is a story by A.E. Van Vogt in "The War Against the Rull" where an all-pervasive vibration leads to a coming of age for the youthful protagonist.

==Transcript==
:[Cueball is standing in an empty room looking in the direction of the next frame.]

:[Cueball turns his head and looks the other way.]

:[Three smaller panels with the same total height as the first two frames follows. In the first frame Cueball walks on a grey surface.]

:[In the next Cueball is standing between two doors, looking over his shoulder towards the one to the left, but choosing the one to the right behind which a stair is. He is waking towards this door with his hand out towards the knob.]

:[In the last of these smaller panels Cueball has just walked down to the bottom of the stairs.]

:[Cueball walks towards a machine that is standing near a wall connected to a socket in the wall. On the machine it says:]
:High pitched hum generator

:[Cueball kneels behind the machine and unplugs it from the socket in the wall.]
:High pitched hum generator

:[Cueball walks away from the machine, the plug now lying on the floor between the wall and the machine.]
:High pitched hum generator

==Trivia==

*'Empty room hum' is also referred to in [[273:_Electromagnetic_Spectrum#The comic in detail|other waves]] in [[273: Electromagnetic Spectrum]] and the title text in comic [[597: Addiction]].

{{comic discussion}}
[[Category:Comics featuring Cueball]]

1492: Dress Color

2023-05-15T17:31:29Z

LostXOR: Removed requirement of Flash player

{{comic
| number = 1492
| date = February 27, 2015
| title = Dress Color
| image = dress_color.png
| titletext = This white-balance illusion hit so hard because it felt like someone had been playing through the Monty Hall scenario and opened their chosen door, only to find there was unexpectedly disagreement over whether the thing they'd revealed was a goat or a car.
}}

==Explanation==
This comic shows two drawings of a woman wearing the same dress, but with different background (and body) colors. The two drawings are split with a narrow vertical portion of an image from the web.

The comic strip refers to a {{w|the dress|dress}} whose image went viral on [http://swiked.tumblr.com/post/112174461490/officialunitedstates-unclefather Tumblr] only hours before the strip was posted and soon showed up also on [http://www.reddit.com/r/explainlikeimfive/comments/2xaprc/eli5why_does_this_dress_appear_whitegold_to_some/ Reddit], [https://twitter.com/hashtag/thedress?src=hash Twitter], [http://www.wired.com/2015/02/science-one-agrees-color-dress/ Wired] and on [http://www.nytimes.com/2015/02/28/business/a-simple-question-about-a-dress-and-the-world-weighs-in.html The New York Times].

Due to the dress's particular color scheme and the exposure of the photo, it forms an {{w|optical illusion}} causing viewers to disagree on what color the dress actually seems to be. The xkcd strip sandwiches a cropped segment of the photographed dress between two drawings which use the colors from the image against different backgrounds, leading the eye to interpret the white balance differently, demonstrating how the dress can appear different colors depending on context and the viewer's previous experiences.

Both dresses have exactly the same colors actually:
*RGB 113, 94, 58 (orange) <div style="display:inline-block; height:1em; width:1em; background-color: #715E3A"></div>
*RGB 135, 154, 189 (blue) <div style="display:inline-block; height:1em; width:1em; background-color: #879ABD"></div>

Below is an illustration demonstrating that the "colors" of the [https://nvuvu.com/collections/sparkly-dresses/ dresses] are the same by connecting them with two lines with the above-mentioned colors (all the way!) and another which has one side flipped and merged into the other:

[[File:dress.png]] [[File:dress2.png]]

Similar types of illusions can be seen at Wikipedia's {{w|Optical illusion#Color_and_brightness_constancies|optical illusion page}} and [http://www.echalk.co.uk/amusements/OpticalIllusions/colourPerception/colourPerception.html echalk].

This image has sparked surprisingly heated debate in many internet communities. A select few individuals may have prior experience with optical illusions of this ilk, but because this particular image went viral - it got heavy exposure over such a short amount of time - it reached millions of people who aren't so familiar with these sorts of mind tricks. To the uninitiated, the color of the dress seems immediately obvious; when others cannot see it their way, it can be a surreal (even uncomfortable) experience.

As an aside, the retailer Roman Originals would later [http://i0.kym-cdn.com/photos/images/newsfeed/000/921/267/de3.png confirm the dress was blue with black lace], and that a white dress with gold lace was not offered among the clothing line.

The title text refers to the game show {{w|Let's Make a Deal}}, hosted by Monty Hall, which was famous for having contestants pick among several doors which either had a real prize (for example, a car) or a joke prize (for example, a goat). [[Randall]] states that people find the dress color issue just as baffling as if upon opening the chosen door no one can agree if the item behind the door is a car or a goat. This is a reference to what has become known as the "{{w|Monty Hall problem}}:" if there are two goats and a prize behind three doors, the contestant has chosen a door, and one of the unchosen doors is opened to reveal a goat, should the contestant change his/her choice? Statistically, the answer is yes, but many people find this counterintuitive; discussion of this problem in ''Parade'' magazine touched off public outrage similar to the viral dress image.

Randall is presumably pointing out how ridiculous it is for people who don't understand the underlying science to become so adamant in defending their beliefs. A spoof of the "Monty Hall problem" previously appeared in [[1282: Monty Hall]], where [[Beret Guy]] decides to take the goat.

==Transcript==
:[Two images of a woman in a dress on each side of an image of a close up of a real dress with the same colors. On the left, she is colored blue on a dark blue background, while on the right, she is brown against a white background. Her dress is the same color in each panel - the same as the real one in between.]

{{comic discussion}}

[[Category:Comics with color]]
[[Category:Photography]]

1472: Geography

2023-05-12T20:11:56Z

LostXOR: Replaced dead link with Wayback Machine archive.

{{comic
| number = 1472
| date = January 12, 2015
| title = Geography
| image = geography.png
| titletext = The place I'd least like to live is the farm in the background of those diagrams showing how tornadoes form.
}}

==Explanation==
The comic is a map showing examples of {{w|geographical feature}}s as they would be presented in a {{w|geography}} textbook. May be based on the first page of the book [http://nicksharratt.com/books/other_authors/you_choose.html You Choose] which displays a map of locations similar in style to the one used in the comic and asks the reader "If you could go anywhere, where would you go?".

[[Randall]] notes that he would like to live in the middle of this region. These maps include an unusual density of different land forms, leading to an interesting environment in which to live. In the real world, these geographical features might take up far more space, and the geologic forces that shape them might create far different patterns than those shown. This kind of {{w|Neverland}} of geographical feature would offer a range of outdoor activities and landscapes that would make it a very nice place to live, as long as the volcano does not erupt.

Some of the geographic features do have a (very) loose similarity to the area around {{w|Boston}}, where Randall lives. Also near Boston is one geographical feature that Randall has included in this map but has refrained from labeling, the {{w|isthmus}} between the peninsula and the forest.

On the other hand, the map actually looks quite a bit like the area around southwestern {{w|Washington (State)|Washington}} and northwestern {{w|Oregon}}, with the reader facing south so the {{w|High Desert (Oregon)|high desert}} is on the upper left. The volcano could be {{w|Mount Rainier|Rainier}} or {{w|Mount St. Helens|St. Helens}}. Real-world outdoor enthusiasts do indeed appreciate the Neverlandish landscape. Having little Spanish influence, locals would refer to a "mesa" as a {{w|butte}}.

The title text discusses a different type of diagram usually found in geography textbooks, the one [https://web.archive.org/web/20180322230418/https://scied.ucar.edu/sites/default/files/images/large_image_for_image_content/tornado_fmn_lg_0.gif showing the mechanism of tornado formation]. Randall notes that he would least like to live in the farm typically depicted in the background of such diagrams. This is likely because the farm is depicted as being on a vast, featureless stretch of flat prairie, the opposite of the rich landscape in the comic. The monotonous landscape would reflect that of {{w|Tornado Alley}}, an area of the central United States where a large number of tornadoes form, and which makes up a large portion of the {{w|Great Plains}}. His dislike for this type of area may also simply be due to the damage created when a tornado hits. That said, chances of a ''direct'' tornado hit on any given house are slim compared to simply the risk of property damage. Living near an active volcano may be much more dangerous than living in Tornado Alley. Tornadoes are a [[:Category:Tornadoes|recurring subject]] on xkcd.

Here is an alphabetical list of the different land forms with wiki links: 
{{w|Bay}}, {{w|Desert}}, {{w|Forest}}, {{w|Glacier}}, {{w|Hills}}, {{w|Island}}, {{w|Lagoon}}, {{w|Lake}}, {{w|Mesa}}, {{w|Mountains}}, {{w|Peninsula}}, {{w|Plain}}, {{w|River delta|Delta}}, {{w|River}}, {{w|Sea}}, {{w|Strait}} and {{w|Volcano}}.

==Transcript==
:[A colorful map shows various possible land forms which are labeled (and the last one with a spelling mistake included here). In general reading order the labels are:]
:Desert
:Mountains
:Sea
:Glacier
:Plain
:Island
:Volcano
:Lake
:River
:Delta
:Strait
:Hills
:Lagoon
:Bay
:Mesa
:Forest
:Penninsula

:[In the middle of these land forms, under the river and between the lake and the lagoon there is a black dot on the green bank of the lagoon with an arrow pointing it out. The arrow starts above the lake to the left of the glacier and is labeled:]
:My house

:[Below the panel there is a caption:]
:If I could live anywhere, I would choose the example map from geography books that explains what everything is called.

==Trivia==
*Randall has misspelled ''peninsula'' with an extra "n" as pe'''nn'''insula.

{{comic discussion}}

[[Category:Comics with color]]
[[Category:Geography]]
[[Category:Maps]]
[[Category:Tornadoes]]
[[Category:Volcanoes]]

1463: Altitude

2023-05-12T20:02:08Z

LostXOR:

{{comic
| number = 1463
| date = December 22, 2014
| title = Altitude
| image = altitude.png
| titletext = "TURN OFF THE LASER GUIDE STAR" "WHY" "STAR CATS"
}}

==Explanation==
In this comic, Randall is making fun of how {{w|Altitude sickness|oxygen deprivation}} can lead to reduced mental acuity. Dizziness, lightheadedness, impaired judgment, and euphoria are symptoms of oxygen deprivation, or hypoxia. Those researchers would benefit from having a written list or plan developed while they were still functioning at peak mental acuity.
Note that high altitude does not lead to severe effects as described in the comic.

Here, two astronomers are heading up a mountain, towards the observatory they work at. Initially, they discuss what they are planning on doing once they reach the summit, mentioning [http://exoplanets.astro.yale.edu/instrumentation/iodine_cells.php Iodine cells], used for wavelength calibrations of high-resolution RV spectra between 501 and 610 nm. As they continue, the mental clarity of the researchers devolves as they approach the high altitude telescope, leading to increasingly juvenile and almost intoxicated behavior. One researcher mentioned her head feels funny, while the other makes a remark about taping down the observatories to prevent them from rolling away, an absurd remark considering observatories are firmly rooted and even if they weren't, it would take an excessive amount of tape to stop them from rolling away.

Once inside the observatory, they have completely forgotten about their original plans. Instead of doing a general calibration, they are playing with the telescopes, looking at each other's faces through them and deciding to make out with each other. This is why [[Randall]] mentions that astronomers working at high altitude observatories must write down their plans ahead of time at sea level, as the low oxygen leads to reduced mental acuity.

It should be noted that the phrase "low oxygen" refers to the lower partial pressure of oxygen at altitude. The proportion of oxygen at high elevations is still approximately a fifth of the atmosphere, the same as at sea level. The altitude sickness is caused by lowered atmospheric pressure which leads to smaller amount of oxygen actually delivered ("pushed") into bloodstream.

The title text refers to a {{w|laser guide star}} a device for focusing telescopes by making artificial reference points in the sky. The reference points are created by shooting a powerful laser into the sky. The concern of the astronomer in the comic is that an imagined "star cat" may be attracted to the laser in the same way that cats playfully chase laser beams projected on surfaces. Cats' reactions to laser pointers were previously explored in [[729: Laser Pointer]].

==Transcript==
:Because of low oxygen, astronomers working at high altitude telescopes may need to write down their plans ahead of time while at sea level.

:[Some astronomers are inside a sea-level research facility.]
:Astronomer #1: Ok, let's head up to the observatory.

:[The astronomers drive uphill.]
:Astronomer #1: When we reach the summit, we'll check the iodine cell and do a general calibration.
:Astronomer #2: Sounds good.

:[The astronomers have reached the high-altitude observatory.]
:Astronomer #1: My head feels funny.
:Astronomer #2: Look at those telescope domes. I hope they don't roll away.
:Astronomer #1: Maybe we should tape them down.

:[The astronomers are inside one of the domes.]
:Astronomer #1: Haha, look at this mirror! My face is huge!
:Astronomer #2: I see your face in the telescope! I discovered you!
:Astronomer #1: Let's make out!

{{comic discussion}}

1463: Altitude

2023-05-12T20:01:26Z

LostXOR: Rewrote part about tape

{{comic
| number = 1463
| date = December 22, 2014
| title = Altitude
| image = altitude.png
| titletext = "TURN OFF THE LASER GUIDE STAR" "WHY" "STAR CATS"
}}

==Explanation==
In this comic, Randall is making fun of how {{w|Altitude sickness|oxygen deprivation}} can lead to reduced mental acuity. Dizziness, lightheadedness, impaired judgment, and euphoria are symptoms of oxygen deprivation, or hypoxia. Those researchers would benefit from having a written list or plan developed while they were still functioning at peak mental acuity.
Note that high altitude does not lead to severe effects as described in the comic.

Here, two astronomers are heading up a mountain, towards the observatory they work at. Initially, they discuss what they are planning on doing once they reach the summit, mentioning [http://exoplanets.astro.yale.edu/instrumentation/iodine_cells.php Iodine cells], used for wavelength calibrations of high-resolution RV spectra between 501 and 610 nm. As they continue, the mental clarity of the researchers devolves as they approach the high altitude telescope, leading to increasingly juvenile and almost intoxicated behavior. One researcher mentioned her head feels funny, while the other makes a remark about taping down the observatories to prevent them from rolling away, an absurd remark considering observatories are firmly rooted and even if they weren't, it would take an excessive amount of tape to stop them.

Once inside the observatory, they have completely forgotten about their original plans. Instead of doing a general calibration, they are playing with the telescopes, looking at each other's faces through them and deciding to make out with each other. This is why [[Randall]] mentions that astronomers working at high altitude observatories must write down their plans ahead of time at sea level, as the low oxygen leads to reduced mental acuity.

It should be noted that the phrase "low oxygen" refers to the lower partial pressure of oxygen at altitude. The proportion of oxygen at high elevations is still approximately a fifth of the atmosphere, the same as at sea level. The altitude sickness is caused by lowered atmospheric pressure which leads to smaller amount of oxygen actually delivered ("pushed") into bloodstream.

The title text refers to a {{w|laser guide star}} a device for focusing telescopes by making artificial reference points in the sky. The reference points are created by shooting a powerful laser into the sky. The concern of the astronomer in the comic is that an imagined "star cat" may be attracted to the laser in the same way that cats playfully chase laser beams projected on surfaces. Cats' reactions to laser pointers were previously explored in [[729: Laser Pointer]].

==Transcript==
:Because of low oxygen, astronomers working at high altitude telescopes may need to write down their plans ahead of time while at sea level.

:[Some astronomers are inside a sea-level research facility.]
:Astronomer #1: Ok, let's head up to the observatory.

:[The astronomers drive uphill.]
:Astronomer #1: When we reach the summit, we'll check the iodine cell and do a general calibration.
:Astronomer #2: Sounds good.

:[The astronomers have reached the high-altitude observatory.]
:Astronomer #1: My head feels funny.
:Astronomer #2: Look at those telescope domes. I hope they don't roll away.
:Astronomer #1: Maybe we should tape them down.

:[The astronomers are inside one of the domes.]
:Astronomer #1: Haha, look at this mirror! My face is huge!
:Astronomer #2: I see your face in the telescope! I discovered you!
:Astronomer #1: Let's make out!

{{comic discussion}}

1329: Standing

2023-05-11T19:53:50Z

LostXOR: Added link to persistence hunting and removed untrue statement about valves in leg veins only working when moving.

{{comic
| number = 1329
| date = February 12, 2014
| title = Standing
| image = standing.png
| titletext = At first I was making fun of them, but joke's on me--the deer is surprisingly ergonomic, except for the kicks.
}}

==Explanation==
{{w|Standing desk}}s are a current fad in modern tech companies. Supposedly more {{w|ergonomic}} and comfortable than sitting all day, they can be combined with treadmills or stationary bicycles to enable exercise to be taken while working. [[Cueball]] tells [[Megan]] that standing desks are inferior to his solution, strapping his laptop to a deer. The deer constantly runs away from [[Cueball]], forcing him to chase and get exercise (and probably get kicked if he catches up). Additionally, by mentioning the common line of "humans weren't meant to sit all day", he is saying that his deer-based solution is much more similar to the task that humans evolved to do, namely {{w|Hunter-gatherer|hunting and gathering}}. Humans are in fact one of the few species built for {{w|persistence hunting}}, and are able to chase prey for more than four hours in ideal conditions. This is also why one's legs feel sore when standing for extended periods but not while moving.

The title text takes this a step further, saying that the deer was surprisingly ergonomic, apart from the kicks — which would, presumably, be quite debilitating. The ergonomics could be due to the soft, warm nature of the flesh compared to typical cold, hard tables.

==Transcript==
:[Cueball is running after a deer with a laptop strapped to its back, while Megan looks on.]
:Cueball: Humans aren't built to sit all day. This is much healthier.

:[Caption below the panel]
:My Hobby: One-upping the standing desk people

{{comic discussion}}
[[Category:My Hobby]]
[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Megan]]
[[Category:Animals]]

1324: Weather

2023-05-11T19:46:40Z

LostXOR: Removed unnecessary remark about pressure in Minnesota.

{{comic
| number = 1324
| date = January 31, 2014
| title = Weather
| image = weather.png
| titletext = At least if you're really into, like, Turkish archaeology, store clerks aren't like 'hey, how 'bout those Derinkuyu underground cities!' when they're trying to be polite.
}}
==Explanation==
Social norm accepts casual small-talk as an ice breaker for interaction — usually it is always safe to talk about the weather without hitting any disagreements as there are rarely any personal viewpoints about the weather — in contrast small-talk is never about political subjects or similar where chances are that there are strong personal viewpoints.

In this strip [[Cueball]] is described a "weather geek", enjoying subjects such as {{w|meteorology}} and {{w|weather forecasting}}. When [[Hairy]] makes a comment about the weather, Cueball launches into a detailed technical discussion, not realizing Hairy is simply trying to engage in small-talk. Only weather geeks would have this problem, but this topic is a common opening for a conversation in casual small-talk. Cueball switches to small-talk once he realizes that Hairy is confused and didn't expect this level of technical information.

As to the jargon:
*{{w|Jet stream|Jet streams}} are strong air currents high in the atmosphere which have a big influence on the weather.
*18z is 18:00 {{w|Coordinated Universal Time|UTC}} (6 PM in London, 10 AM in California). See {{w|ISO 8601}} at Wikipedia. The letter "Z" is used as 'Zulu' in the {{w|NATO phonetic alphabet}}, meaning just UTC.
*GFS is the {{w|Global Forecast System}} (also known as NCEP-GFS). It is a computer model used by the {{w|National Weather Service}} to predict the weather up to 16 days in advance. The model is run 4 times a day and the output is distinguished by the UTC hour it was started (18z in this case).
*Part of the prediction is the {{w|atmospheric pressure}} expressed in {{w|Bar (unit)|millibars}} (or mb). 960 mb is very low pressure, which is usually associated with seriously bad weather.
*"Think it'll verify?": A forecast "verifies" when an analysis of observations at the forecast time are found to match the forecast. Cueball is asking if Hairy thinks the prediction of a 960 mb low will be shown to have been correct.

The title text clarifies the problem weather nuts like Cueball here have: Unlike other geeky pursuits (like, say, the {{w|Derinkuyu Underground City|Derinkuyu Underground Cities}}, [[1368: One Of The|one of the]] most well-known {{w|History of Turkey|archaeological sites in Turkey}}) weather is a fairly common small talk subject. As a result, weather geeks have to be constantly vigilant so as not to launch into technical monologues.

==Transcript==
:[Cueball and Hairy are talking.]
:Hairy: So, how 'bout this weather?
:Cueball: I ''know,'' right? The whole jet stream layer is ''nuts!''
:Hairy: Um, sure...
:Cueball: The 18z GFS forecasts 960mb by Tuesday. Think it'll verify?
:Hairy: What?
:Cueball: ...Right. Sorry. Uh, yeah! Weather sure has been crazy.

:[Caption below the panel:]
:Weather geeks have it tough.

{{comic discussion}}

[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Hairy]]
[[Category:Social interactions]]
[[Category:Weather]]

1249: Meteor Showers

2023-05-11T17:04:07Z

LostXOR: Updated dead link with Wayback Machine URL

{{comic
| number = 1249
| date = August 9, 2013
| title = Meteor Showers
| image = meteor showers.png
| titletext = Remember, meteors always hit the tallest object around.
}}

==Explanation==
This comic spoofs the way that astronomical events are often reported in the mass media — events are often tagged with undeserved superlatives or described as being more dramatic than they actually are. In some cases, outright misinformation is spread. This phenomenon occurs in part by the result of over-eager scientists, but mostly because of journalists with no deeper knowledge on the subject they write about.

Meteor showers typically occur regularly each year. It always happens at the same days because the Earth is crossing the dust path of a particular {{w|comet}}. Sometimes meteor showers are in fact likely to be relatively spectacular when the peak of the shower occurs while your part of the world is in darkness and there is little moonlight. However, even in these cases it must be understood that there is nothing unusual about the meteor shower itself. The shower consists of small particles about one millimeter in diameter. Only their high speed lets them produce enough light to be visible from Earth's surface. The names of the showers refer to the {{w|constellation}} from which they appear to radiate.

Most of the meteor showers listed in the comic are real, but some are made up (and indicated as such below).

*''{{w|Quadrantids}} - January 4th - Bring pets inside during peak activity''
:While keeping pets inside may be reasonable on days when fireworks are let off in the beginning of a new year, no regular meteor shower poses much danger to pets.
*(made-up) ''Tricuspids - January 21st - Not viewable in region 2 countries''
:Apparently a play on the {{w|tricuspid valve}} in mammalian hearts, or possibly on bicuspid teeth. The mention of "Region 2" is a reference to {{w|region locking}}, a digital rights management (DRM) scheme intended to restrict media to certain areas.{{Citation needed}} DRM of course does not apply to natural events. However, meteor showers are also geographically restricted, and the visible area might roughly coincide with a DRM region (Though Region 2 covers a large and scattered area, not being strictly geographical).
*({{w|Alpha Centaurids|Alpha}} / {{w|Theta Centaurids|Theta}}) ''Centaurids - February 6th - Too faint to see without going outside''
:Since indoor lights and window glass make them harder to see, it would take a ''very'' bright meteor (like the Chelyabids two entries below) to be visible without going outside.
*(made-up) ''Beta Aquariids - February 10th - Inverted shower converges toward Aquarius instead of radiating away''
:This fictional shower would collect shooting stars into the origin to prepare for the real {{w|Eta Aquariids}} meteor shower associated with Halley's comet and ''diverging'' from {{w|Eta Aquarii}} in Aquarius; the real shower peaks around May 6th.
:Due to perspective, meteor showers appear to radiate outwards from a certain point in the sky. Meteor showers may be seen to converge on a point on the opposite side of the sky, but with the earth in the way there would only be a few visible going past the edge, seen as nearly parallel streaks overhead, so the convergence point would hardly be notable.
*(made-up) ''Chelyabids - February 15th - Only one meteor per shower, but it's big.''
:A reference to the February 15, 2013, {{w|Chelyabinsk meteor}} whose explosion shattered windows within a large radius.
*''{{w|Lyrids}} - April 22nd - Meteors sometimes scream''
:A meteor large enough to reach the lower atmosphere could produce sound audible to observers on the ground, but this is very unusual.
*''Daytime {{w|Zeta Perseids}} - June 9th - Likely a NASA hoax''
:This shower is mostly observed via its effects on radio and TV signals, and therefore a good target for conspiracy theorists responding to [https://web.archive.org/web/20160322133927/http://science1.nasa.gov/science-news/science-at-nasa/2000/ast06jun_1m June's Invisible Meteors - NASA Science].
*''{{w|June Bootids|June Boötids}} - June 27th - 50/50 mix of meteors and shooting stars''
:The "50/50 mix of meteors and shooting stars" is a joke, as "meteor" and "shooting star" are synonymous.
*''{{w|Southern Delta Aquariids}} - July 19th - Meteors very bright, but stationary''
:This is saying that they are indistinguishable from stars, or that the stars themselves are actually meteors.
*(made-up) ''Dromaeosaurids - July 22nd - Fast, highly intelligent, can open doors''
:{{w|Dromaeosauridae|Dromaeosaurids}} are a family of dinosaurs containing the genus ''Velociraptor'', well-known from the movie Jurassic Park in which they are presented as a deadly menace, fast and especially intelligent to the point of understanding how to open a door; this representation of Velociraptors is a [[:Category:Velociraptors|recurrent topic in xkcd]].
*''{{w|Perseids}} - August 12th - Instead of falling from sky, meteors erupt from ground''
:Erupting from the ground is the funny inverse of falling from the sky, what meteors always do.
*(made-up) ''Tau Pyramids - August 15th - Visible even when eyes are closed''
:Probably a reference to {{w|Pyramidal cells}}, a type of neuron. The "tau" reference has two possibilities. The "visible even when eyes are closed" could refer to the Tau particle, a heavy sibling of the electron. When they traveled outside of Earth's magnetosphere on their way to the Moon, Apollo astronauts saw flashes of light about every three minutes even with their eyes closed; these were caused by high energy particles (cosmic rays) penetrating their eyes and brain. The other possibility is that it refers to {{w|Tau protein}}, a normal structural protein within brain neurons. In Alzheimer's Disease, abnormal Tau proteins can aggregate within pyramidal cells to form insoluble skeins. The number of these "{{w|Neurofibrillary tangle|neurofibrillary tangles}}" roughly correlate with the severity of cognitive impairment.
*''{{w|Draconids}} - October 8th - Very slow, but follow you if you run''
:This may have something to do with the fact that "draconids" etymologically means "of the dragon", which could make for a fearsome meteor shower. And if you run it will track you down, albeit slowly. This may also be a reference to {{w|Boo (character)|Boo}}, a character in the Mario series of video games that is slow but follows you if you turn your back on them. In the game Terraria, meteors (or rather, "meteor heads") follow this exact behavior.
*''{{w|Orionids}} - October 21st - Entire shower happens at once''
:Rather than taking place over the course of a week, all the meteors in the shower happen at the same time. This would involve about 3000 meteors appearing simultaneously, which would be quite an impressive sight.
*''{{w|Leonids}} - November 17th - In 1966, unusually active Leonid shower killed God''
:There ''was'' a very active Leonid shower (a "meteor storm") in 1966, and a precursor to it in 1965. The article ''{{w|Is God Dead?}}'' was published in ''Time Magazine'' on April 8 of 1966. Perhaps this suggests that the meteors killed God earlier in the year when they and He were further out in the solar system?
*''{{w|Geminids}} - December 13th - Can be deflected with tennis rackets''
:Meteors usually don't reach the surface of the Earth, being destroyed in the atmosphere. If they do approach the surface, deflecting them with tennis racquets would probably not be the most effective strategy{{Citation needed}}, unless Randall is implying that the Geminid swarm is composed of tennis balls.

The title text refers to the folk wisdom that ''lightning'' strikes the tallest thing around, but this has never been applied to meteors, where it is basically the size (area) that determines the likelihood of an impact with a given object. [[Randall]] expressed frustration over how "maddeningly inexact" the lightning statement is, and elaborated on the problem mathematically, in the [[what if?]] ''{{what if|16|Today's topic: Lightning}}''.

==Transcript==
:[A list of 16 meteor showers, with a caption above, labels on the three columns and then every other row in gray, beginning with a gray row beneath the line below the column labels.]
:{| border="1" cellpadding="1" cellspacing="1" class="wikitable" style="width: 60%; text-align: left;"
!colspan="3"|The <big><big>xkcd guide</big></big> to <big><big>meteor showers</big></big>
|-
|'''Name'''
|'''Peak'''
|'''Notes'''
|-
|Quadrantids
|January 4th
|Bring pets inside during peak activity
|-
|Tricuspids
|January 21st
|Not viewable in region 2 countries
|-
|Centaurids
|February 6th
|Too faint to see without going outside
|-
|Beta Aquariids
|February 10th
|Inverted shower converges toward Aquarius instead of radiating away
|-
|Chelyabids
|February 15th
|Only one meteor per shower, but it's big.
|-
|Lyrids
|April 22nd
|Meteors sometimes scream
|-
|Daytime Zeta Perseids
|June 9th
|Likely a NASA hoax
|-
|June Boötids
|June 27th
|50/50 mix of meteors and shooting stars
|-
|Southern Delta Aquariids
|July 19th
|Meteors very bright, but stationary
|-
|Dromaeosaurids
|July 22nd
|Fast, highly intelligent, can open doors
|-
|Perseids
|August 12th
|Instead of falling from sky, meteors erupt from ground
|-
|Tau Pyramids
|August 15th
|Visible even when eyes are closed
|-
|Draconids
|October 8th
|Very slow, but follow you if you run
|-
|Orionids
|October 21st
|Entire shower happens at once
|-
|Leonids
|November 17th
|In 1966, unusually active Leonid shower killed God
|-
|Geminids
|December 13th
|Can be deflected with tennis rackets
|}

==Trivia==
*In the [http://www.explainxkcd.com/wiki/images/archive/8/8a/20130809215612!meteor_showers.png original] version of this comic the date beneath the Dromaeosaurids shower was June 12th, the date of the velociraptor attacks in the Jurassic Park movie. To get the order of the dates correct it was probably easier to change just the date rather than move the Dromaeosaurids to the entry below June 9th.

{{comic discussion}}

[[Category:Charts]]
[[Category:Astronomy]]
[[Category:Velociraptors]]
[[Category:Jurassic Park]]
[[Category:Animals]] 
[[Category:Sport]] 
[[Category:Religion]]

1230: Polar/Cartesian

2023-04-07T17:23:50Z

LostXOR: Forgot to make sure Cartesian was capitalized everywhere in my previous edit.

{{comic
| number = 1230
| date = June 26, 2013
| title = Polar/Cartesian
| image = polar_cartesian.png
| titletext = Protip: Any two-axis graph can be re-labeled 'coordinates of the ants crawling across my screen as a function of time'.
}}

==Explanation==
This comic plays upon the difference between reading a {{w|polar coordinate system|polar coordinate plot}} and the more common {{w|Cartesian coordinate system|Cartesian coordinate plot}}.

The graph purports to show the certainty in the viewers mind that it is a clockwise polar plot, as a function of time.

If seen as a Cartesian plot, the y (vertical) axis represents 'certainty' while the x (horizontal) axis represents 'time'. Each point on the plot is represented by two coordinates, the x-value and the y-value. As time increases, we move to the right and see the initial certainty of 50% decreases gradually to zero. That is, after a certain amount of time, we are certain that it is NOT a polar plot.

In a polar plot, each point on the plot is also located by two values, but in this case they are the radius (the distance from the origin) and the angle between the radius and an arbitrary starting line. Here, the radius represents 'certainty' and the angle to the vertical represents 'time'. In this view, we see that as time increases (as we move clockwise around the plot) the initial certainty (the same 50%) now ''increases'' to a final value of 100%. That is, after a certain amount of time, we are certain that it IS a polar plot.

The intended joke seems to be that the graph is an exercise in confirmation bias. Whichever type you initially hypothesize is correct, that view will be confirmed by investigation. This is because the two different views are both correct - the graph can equally be considered a Cartesian or polar plot. This is somewhat counter-intuitive.

Throughout the graph, the sum of the two probabilities is 100%, i.e. (polar-observer's certainty that the graph is polar) + (Cartesian-observer's certainty that the graph is polar) = 100%. The shape of the graph appears to be (in clockwise polar form) r(t)=100/(1+cos(t)).

If the reader is open-minded, they would never reach certainty (0% / 100% depending on how you read the graph) because there isn't enough information to clearly decide either way.

The title text is a joke that if you are unsure how to label any two-axis (two-dimensional) graph, you can just say it represents the 'coordinates of the ants crawling across my screen as a function of time', and nobody could then argue with your data. "Hey, that's the path they walked!"

==Transcript==
:[Caption above the panel:]
:Certainty that this is a clockwise polar plot, not a Cartesian one, as a function of time:
:[There is a graph. The Y axis is marked out from 0% to 100%. The X axis is unmarked. A red line starts at 50% and traces out a roughly parabolic trend downwards along the X axis.]

{{comic discussion}}
[[Category:Comics with color]]
[[Category:Math]]
[[Category:Line graphs]]
[[Category:Protip]]
[[Category:Self-reference]]
[[Category:Ants]]

1230: Polar/Cartesian

2023-04-07T17:22:07Z

LostXOR: Uncapitalized "Polar" since it's not supposed to be capitalized, unlike "Cartesian".

{{comic
| number = 1230
| date = June 26, 2013
| title = Polar/Cartesian
| image = polar_cartesian.png
| titletext = Protip: Any two-axis graph can be re-labeled 'coordinates of the ants crawling across my screen as a function of time'.
}}

==Explanation==
This comic plays upon the difference between reading a {{w|polar coordinate system|polar coordinate plot}} and the more common {{w|Cartesian coordinate system|cartesian coordinate plot}}.

The graph purports to show the certainty in the viewers mind that it is a clockwise polar plot, as a function of time.

If seen as a Cartesian plot, the y (vertical) axis represents 'certainty' while the x (horizontal) axis represents 'time'. Each point on the plot is represented by two coordinates, the x-value and the y-value. As time increases, we move to the right and see the initial certainty of 50% decreases gradually to zero. That is, after a certain amount of time, we are certain that it is NOT a polar plot.

In a polar plot, each point on the plot is also located by two values, but in this case they are the radius (the distance from the origin) and the angle between the radius and an arbitrary starting line. Here, the radius represents 'certainty' and the angle to the vertical represents 'time'. In this view, we see that as time increases (as we move clockwise around the plot) the initial certainty (the same 50%) now ''increases'' to a final value of 100%. That is, after a certain amount of time, we are certain that it IS a polar plot.

The intended joke seems to be that the graph is an exercise in confirmation bias. Whichever type you initially hypothesize is correct, that view will be confirmed by investigation. This is because the two different views are both correct - the graph can equally be considered a Cartesian or polar plot. This is somewhat counter-intuitive.

Throughout the graph, the sum of the two probabilities is 100%, i.e. (polar-observer's certainty that the graph is polar) + (cartesian-observer's certainty that the graph is polar) = 100%. The shape of the graph appears to be (in clockwise polar form) r(t)=100/(1+cos(t)).

If the reader is open-minded, they would never reach certainty (0% / 100% depending on how you read the graph) because there isn't enough information to clearly decide either way.

The title text is a joke that if you are unsure how to label any two-axis (two-dimensional) graph, you can just say it represents the 'coordinates of the ants crawling across my screen as a function of time', and nobody could then argue with your data. "Hey, that's the path they walked!"

==Transcript==
:[Caption above the panel:]
:Certainty that this is a clockwise polar plot, not a Cartesian one, as a function of time:
:[There is a graph. The Y axis is marked out from 0% to 100%. The X axis is unmarked. A red line starts at 50% and traces out a roughly parabolic trend downwards along the X axis.]

{{comic discussion}}
[[Category:Comics with color]]
[[Category:Math]]
[[Category:Line graphs]]
[[Category:Protip]]
[[Category:Self-reference]]
[[Category:Ants]]

2759: Easily Confused Acronyms

2023-04-07T15:13:56Z

LostXOR: Added LEVER being an uncommon acronym under trivia section

{{comic
| number = 2759
| date = April 5, 2023
| title = Easily Confused Acronyms
| image = easily_confused_acronyms_2x.png
| imagesize = 557x444px
| noexpand = true
| titletext = 'Lever' was originally an acronym for Load Emplification by the Vimulated Emission of Radiation.
}}

==Explanation==
{{incomplete|Created by a RIGHT OMPLIFICATION BY THE BIMULATED OMISSION OF TADIATION - Please change this comment when editing this page. Do NOT delete this tag too soon.}}
In this comic, [[Randall]] compared the Acronym "Laser" with various other five-letter acronyms. He first explained the "Laser" and "Maser" correctly, but the following three are simply the full name of "Laser" with the first word and initials changed. The replacement first word is correct for these acronyms, but the other words formed from changing the first letter are nonsense.

{| class="wikitable" style="margin:auto"
!Acronym !! Comic !! Actual
|-
| {{w|Laser}} || ✅ Light Amplification by the Stimulated Emission of Radiation || '''L'''ight '''A'''mplification by '''S'''timulated '''E'''mission of '''R'''adiation
|-
| {{w|Maser}} || ✅ Microwave Amplification by the Stimulated Emission of Radiation || '''M'''icrowave '''A'''mplification by '''S'''timulated '''E'''mission of '''R'''adiation
|-
| {{w|Sonar}} || ❌ Sound Omplification by the Nimulated Amission of Radiation || '''SO'''und '''N'''avigation '''A'''nd '''R'''anging
|-
| {{w|Radar}} || ❌ Radio Amplification by the Dimulated Amission of Radiation || '''RA'''dio '''D'''etection '''A'''nd '''R'''anging
|-
| {{w|Lidar}} || ❌ Light Implification by the Dimulated Amission of Radiation || '''LI'''ght '''D'''etection '''A'''nd '''R'''anging
|-
| {{w|Lever}} (title text) || |Load Emplification by the Vimulated Emission of Radiation. || ''(not an acronym in common usage)''
|}

Laser and maser are true-to-life acronyms. The remaining 3 words' true meanings are as follows: sonar is short for "sound/sonic navigation and ranging", radar for "radio detection and ranging", lidar for "light detection and ranging". (Note that these 3 each include the second letter from their first word in the acronym.)

The three false definitions simply suppose that all 5 of the acronyms follow the same model and swap out the necessary letters to fit, in a square-peg-round-hole manner.

The title text extends this to the 5-letter word "lever". This is an ordinary word, not a commonly used acronym. Levers have been used since time immemorial (even [https://quatr.us/physics/levers-simple-machines-physics.htm animals have been known to use them)], and predates high-tech uses of radiation by millennia (it's one of the {{w|simple machines}} that {{w|Archimedes}} studied in Ancient Greece). [https://www.explainxkcd.com/wiki/index.php/2722:_Etymonline Etymonline] traces the origin of the word to the year 1300, from the French "levier", which shares the same definition.

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}
:Easily-confused acronyms cheat sheet

:Laser

:Light Amplification by the Stimulated Emission of Radiation

:Maser

:Microwave Amplification by the Stimulated Emission of Radiation

:Sonar

:Sound Omplification by the Nimulated Emission of Radiation

:Radar

:Radio Amplification by the Dimulated Amission of Radiation

:Lidar

:Light Implification by the Dimulated Amission of Radiation
==Trivia==
LEVER is an uncommonly used acronym for Light Electric Vehicle Education and Research.
{{comic discussion}}
[[Category: Science]]
[[Category: Language]]

1430: Proteins

2023-04-06T19:43:06Z

LostXOR: Pointed broken link to Wayback Machine

{{comic
| number = 1430
| date = October 6, 2014
| title = Proteins
| image = proteins.png
| titletext = Check it out--when I tug the C-terminal tail, the binding tunnel squeezes!
}}

==Explanation==
In this comic, [[Cueball]] is asking [[Megan]] what she does, to which she replies that she works on software to predict protein folding. There are many folding prediction software programs. Some of the most well known are {{w|Folding@Home}}, {{w|Rosetta@Home}} and {{w|FoldIt}}.

{{w|Protein folding}} is the process by which proteins, which are floppy, unstructured chains of {{w|amino acids}} when initially synthesized in a cell, assume a stable, functional shape. If the folding process does not complete, or completes incorrectly, the resulting protein can be inactive or even toxic to the body. Misfolded proteins are responsible for several {{w|neurodegenerative}} diseases, including {{w|Alzheimer's disease}}, {{w|amyotrophic lateral sclerosis}} (ALS), and {{w|Parkinson's disease}}, as well as some non-neurodegenerative diseases such as cardiac amyloidosis.

Cueball asks Megan why it is such a hard computational problem; Megan's response is to ask Cueball if he's ever {{w|Origami|folded paper}} to make a {{w|Crane (bird)|crane}}. When he responds in the affirmative, she then compares the problem of predicting protein folding to creating a ''living'' crane by the paper-folding process. The analogy is that a protein cannot just fold to a figurative representation of a bio-molecule, the way a paper crane superficially resembles a live crane; the protein must assume an exact, perfect fold in order to be functional.

{{w|Levinthal's paradox}} is a thought experiment, also constituting a self-reference in the theory of protein folding. In 1969, Cyrus Levinthal noted that, because of the very large number of degrees of freedom in an unfolded polypeptide chain, the molecule has an astronomical number of possible conformations. For example, a polypeptide of 100 {{w|Residue (chemistry)|residue}}s will have 99 peptide bonds, and therefore 198 different {{w|Dihedral angle|phi and psi bond angles}}. If each of these bond angles can be in one of three stable conformations, the protein may misfold into a maximum of 3198 different conformations (including any possible folding redundancy). Therefore, if a protein were to attain its correctly folded configuration by sequentially sampling all the possible conformations, it would require a time longer than the age of the universe to arrive at its correct native conformation. This is true even if conformations are sampled at rapid (nanosecond or picosecond) rates. The "paradox" is that most small proteins fold spontaneously on a millisecond or even microsecond time scale. This paradox is central to computational approaches to protein structure prediction.

As Cueball mentally turns over the hypothetical process of folding paper to make a living crane, he wonders if he is allowed to perhaps "cut" the paper to make more complicated folds available. In origami, purists [https://web.archive.org/web/20200207151442/http://www.barf.cc/jeremy/origami/BOOK/essays/origami_purism/origami_purism.htm] considered it as cheating if you cut the paper or use more than one sheet of paper, which is why Cueball asked if he was 'allowed' to do such in the hypothetical exercise they are discussing.

Megan replies "if you can fold a Protease enzyme;" these are proteins whose job it is to break down (i.e. "cut") other proteins, often in very specific ways. In this manner, Protease enzymes are analogous to extremely specialized scissors, so Megan is effectively saying "You can make cuts if you can fold yourself a pair of scissors." Of course, when trying to predict the folding trajectory in nature of a protein A, and one is allowed to make cuts during the process, one is making the assumption that the Protease that cut protein A is already folded and functional. In other words, making cuts while folding might actually make the process ''more'' complicated, not less, as now you have to consider how the cutting enzyme is folded, too.

The title text refers to the result of folding a flapping bird in origami. By pulling the tail, the head will move forward and down. However, since the joke is about folding proteins, this idea is extrapolated to include the folded proteins. The C-terminus (end of the protein chain), in this case analogous of the tail, if "pulled" would cause a created cavity or tunnel to squeeze, much like pulling a knot would do the same.

{{w|Folding@Home}} (F@H) is a distributed computing project which aims to simulate protein folding for research purposes. Rather than the traditional model of using a supercomputer for computation, the project uses idle processing power of a network of personal computers in order to achieve massive computing power. Individuals can join the project by installing the F@H software (there is also a web version that can be run using Google Chrome) and are then able to track their contribution to the project. Individual members may join together as a team, with leaderboards measuring team and individual contributions.

Note that most modern computers do not "waste" computing time as much as older ones. They dynamically reduce their clock speed and other power consumption at times of low usage. If you donate computer time, you are probably also donating a bit of money to the cause in the form of your electricity bill. Many people consider this to be more fun, convenient and efficient than donating via credit card.

==Transcript==
:[Cueball is talking with Megan.]
:Cueball: What do you do?
:Megan: I make software that predicts how proteins will fold.
:Cueball: Is that a hard problem?
:Megan: Someone may someday find a harder one.
:Cueball: Why is it so hard?
:Megan: Have you ever made a folded paper crane?
:Cueball: Yeah.
:Megan: Imagine figuring out the folds to make an actual ''living'' crane.
:Cueball: ...''just'' folds? Can I make cuts?
:Megan: If you can fold a protease enzyme.

{{comic discussion}}
[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Megan]]

1719: Superzoom

2023-04-04T17:21:48Z

LostXOR: Rewrote part of a paragraph to be more clear.

{{comic
| number = 1719
| date = August 12, 2016
| title = Superzoom
| image = superzoom.png
| titletext = *click* Let him know he's got a stain on his shirt, though.
}}

==Explanation==
In this comic, [[Cueball]] is showing off his new {{w|superzoom}} camera to [[White Hat]]. These are cameras with large zoom lenses, often 25× or higher magnification. He is very excited and starts by exclaiming how they can take detailed photos of the craters on the {{w|Moon}}, and (on better models) relatively large photos of {{w|Jupiter}} even with a resolution so individual clouds can be seen. (See examples of zoom on these objects [https://www.youtube.com/watch?v=CwLbj0fBvXk here] and [https://www.youtube.com/watch?v=de2LjQ5F3HE here] without cloud resolution though, but with Jupiter's {{w|Galilean moons|four large moons}} and {{w|Saturn|Saturn's}} {{w|Rings of Saturn|rings}}.)

He then spots a bird (which is just a speck in the sky) and uses the superzoom for {{w|birdwatching}}, which is a popular use for these cameras. He can see that it's a {{w|peregrine falcon}} and that it has been {{w|Bird ringing|banded}} (ringed) and he can even read the number on the band (later it seems he has more trouble locating birds with his camera in [[1826: Birdwatching]]). He then spots an airplane and having taken a picture of it, he can tell that it is a {{w|Boeing 787 Dreamliner|787 Dreamliner}} from {{w|Japan Airlines}}, and he can even make out the registration number. [https://www.youtube.com/watch?v=p-0X3xJf-kg All this is possible], with a {{w|Nikon Coolpix P900}}, which may not be much larger than the one Cueball stands with here, with an extremely long lens, and at the time of this comics release that type of camera could be [https://www.amazon.com/Nikon-COOLPIX-Digital-Camera-Optical/dp/B00U2W4JEY bought at Amazon] for less than $600. If that is within the limit Cueball gives of a few hundred dollars can be [[1070: Words for Small Sets|debated]]... A [http://shop.usa.canon.com/shop/en/catalog/powershot-sx60-hs-refurbished|Canon SX-60, refurbished] with [https://www.flickr.com/groups/2290116@N21/pool/|65x optical zoom] currently sells for $379. Its predecessor, the SX-50 sold, refurbished, for less than $200 until going out of stock.

Note that before each comment he has taken a picture, presumably zooming further in after each photo of each new object, zooming out again before beginning with the next object.

Finally, White Hat exclaims that he is sold and states that he also want a superzoom camera like Cueball's. Cueball then points the camera down the street, takes a picture, and tells White Hat that the shop on ''Union Road'' has these cameras in stock, indicating that he can see them inside the store (or in their window). He then takes another picture and is able to recognize the worker in the store, Kevin. As mentioned in the title text, after taking another picture he notices a stain on Kevin's shirt and asks White Hat to tell Kevin about the stain when he goes there to buy a superzoom camera. (This was the first time the name Kevin was used in xkcd for a fictive person, see more in [[1795:_All_You_Can_Eat#Kevin|this trivia]]).

Even with the ability of these cameras, it would be difficult for Cueball to be able to make out a specific worker inside the store, but if he is standing near a window it is not impossible, and if he has a stain on his shirt, it is in the same league as spotting a band on a bird in the air. Of course he has to be in a spot where he can see straight to the front of the shop.

The last panel and title text is also a remark on how such cameras can be used to spy on people for quite a far distance, which has often been (ab)used by {{w|Paparazzi|paparazzi photographers}} taking pictures of famous people (often while almost naked or in a bikini or other bathing clothes). Now everyman gets this disconcerting possibility to spy on their neighbors and others for just a few hundred dollars.

There are lenses that can do what Cueball describes about Jupiter's clouds in the comic (e.g., the [https://www.youtube.com/watch?v=IRq18WpQZC0 Canon 5200mm]), but so far not such a small consumer camera as shown in the illustration.

A couple of other factors that many people may not realize until after they've bought a consumer-level superzoom camera is that a) taking a hand-held picture at maximum zoom is typically rather blurry because the lens is magnifying all vibration and it's impossible to hold the camera steady enough (so a camera tripod would be needed), and b) that the lens' aperture at maximum zoom is typically much smaller than at normal focal lengths, with the result that the shutter time must be several times longer to get proper exposure, compounding the vibration / blurry problem. Modern superzoom cameras do have "image stabilization", which can mitigate blurriness due to vibration, but extreme telephoto photography is still more challenging than implied in the comic.

Also having zoomed so much it is very hard to actually locate a moving plane or bird in the sky while looking at the image shown on the camera. And as shown in the comic the lens is zoomed very much in. Of course this could be done by Cueball after having found the flying object with much less zoom. But still if he loses sight of the bird while fully zoomed in it will be almost impossible to find it again without zooming back out.

White Hat and Cueball have discussed photography before in [[1314: Photos]].

==Transcript==
:[White Hat and Cueball are walking right. Cueball is looking down at a camera with a long lens he is holding in both hands.]
:Cueball: I love these superzoom cameras. For a few hundred dollars you can take pictures of Moon craters and Jupiter's clouds.

:[They stop, White Hat looks up in the air while Cueball does the same but through the camera he is holding up to his eye while taking pictures. The camera lens is further zoomed out and is clicking.]
:Cueball: And birds! See that speck up there?
:<nowiki>*Click*</nowiki>
:Cueball: Peregrine falcon!
:<nowiki>*Click*</nowiki>
:Cueball: It's banded, too. Want the number?

:[White Hat looks even further up as Cueball turns left and point the even further zoomed camera almost straight up while taking photos.]
:Cueball: And see that plane?
:<nowiki>*Click*</nowiki>
:Cueball: 787 Dreamliner
:<nowiki>*Click*</nowiki>
:Cueball: Japan Airlines.
:<nowiki>*Click*</nowiki>
:Cueball: Registration is—

:[White Hat looks back down on Cueball who has turned to the right holding the fully out-zoomed camera level to the right along the ground.]
:White Hat: OK, I'm sold—I want one.
:<nowiki>*Click*</nowiki>
:Cueball: They're in stock at the place on Union Road.
:<nowiki>*Click*</nowiki>
:Cueball: Hey, Kevin's working today! He's great.

{{comic discussion}}

[[Category:Comics featuring Cueball]]
[[Category:Comics featuring White Hat]]
[[Category:Photography]]
[[Category:Animals]]
[[Category:Aviation]]

1217: Cells

2023-04-03T17:55:26Z

LostXOR: Added a reason why a drug that works in a petri dish might not work in humans.

{{comic
| number = 1217
| date = May 27, 2013
| title = Cells
| image = cells.png
| titletext = Now, if it selectively kills cancer cells in a petri dish, you can be sure it's at least a great breakthrough for everyone suffering from petri dish cancer.
}}

==Explanation==
{{w|Cancer}} is one of the most feared group of illnesses due to high mortality and a topic visited by Randall in [[:Category:Cancer|past comics]].

Whenever a study finds a hint of a cure, it is hyped up in media as major breakthrough. However, because research is done in a laboratory using cultivated cancer cell assays in petri dishes or well plates, it typically does not take interactions with other parts of a body into consideration, which is ultimately necessary for a patient to survive treatment without harmful side-effects. In order for a cancer treatment to be viable, it would have to primarily target only cancer cells; not healthy ones. Added to this is the issue that major cancer in the body quickly evolves resistance to most treatments, most treatments end up either unused or used as just one in a cocktail of cancer fighting drugs.

Here, [[Randall]] reminds us that there's no need to get excited upon hearing about a drug that kills cancer cells because it may very well harm healthy cells as well, just as a bullet fired from a handgun would. Alternatively, one could interpret the message that, since something as mundane as a handgun is capable of destroying cancer cells, it really is not too impressive for a drug to make that claim.

The title text suggests that even if a drug did only kill cancer cells while leaving healthy cells alone, the human body still has many other complex processes that may render a drug that works in a petri dish insufficient. For instance, a drug that kills cancer cells in a petri dish may not be able to get at cancer cells deep within a human body, or it may have side effects that render it unusable. It is a long way from the laboratory to the pharmacy.

A more humorous interpretation of the title text is that it will only kill cancer cells if they are in petri dishes, and not anywhere else. The naming convention here is similar to "lung cancer", breast cancer", etc., but of course, petri dishes are not normally a part of human organism{{Citation needed}}. Less probably, it might be about cancer cells that originated from, but are not necessarily located within, petri dishes, making the scenario even more oddly specific.

==Transcript==
:[Caption above the panel:]
:When you see a claim that a common drug or vitamin "kills cancer cells in a petri dish,"
:Keep in mind:

:[Cueball in a lab coat stands on a chair next to a desk, pointing a gun at a petri dish. There is a microscope on the desk.]

:[Caption below the panel:]
:So does a handgun.

{{comic discussion}}

[[Category:Comics featuring Cueball]]
[[Category:Biology]]
[[Category:Cancer]]
[[Category:Scientific research]]

1963: Namespace Land Rush

2023-04-03T17:47:21Z

LostXOR: Removed irrelevant part about Explain XKCD and reworded slightly.

{{comic
| number = 1963
| date = March 5, 2018
| title = Namespace Land Rush
| image = namespace_land_rush.png
| titletext = You can also just mash the keyboard at random, but you might end up with a gibberish name no one can pronounce.
}}

==Explanation==

When a new web service starts, such as a forum, a social media server or an email portal, the people who sign up get to choose their username on the service, which, in most cases, blocks future users from using those usernames. Common names such as "john" are likely to be taken quickly. This is analogous to the way that land was distributed in America, with the first to claim able to choose the best land.

This comic is a list of usernames [[Randall]] suggests should be used if they are available.

The title text is a self-reference to "xkcd"; the name of the comic is a purposefully unpronounceable phrase created by Randall. The fact that an unpronounceable name is portrayed as a disadvantageous outcome is also humorous because the comic has a section dedicated to unpronounceable usernames.

(Note: for a more serious list of problematic user names to block from a service provider’s point of view, see [https://ldpreload.com/blog/names-to-reserve Hostnames and usernames to reserve] as well as [https://tools.ietf.org/html/rfc2142 RFC 2142].)

==Table==
{| class="wikitable"
!style="width:30%"|Entry
!style="width:70%"|Explanation
|-
!colspan=2|Straightforward (Usernames that a person would use under typical circumstances)
|-
|<Your usual username, if any>
|Most internet users will have settled on some unique handle that they try to use across all platforms. Even if this wasn't a new service, most people would try this first.
|-
|<Your given name>
|More rare is using one's nickname or first name as their username, since the amount of common names will mean many users share a name. Thus, if you can get your given name, you will have a simple username that many others wanted, and without resorting to prefixes or numbers (i.e. Xx_MyName00_xX)
|-
|<Your full name>
|Similar to your given name, but slightly more unique since a last name and/or middle name is added.
|-
|<Initial><Surname>
|A common second choice if a given or full name is already in use.
|-
|<Surname>
|Possibly available if your last name is more uncommon; names like "Smith" or "Kim" will probably be taken faster than even given names.
|-
!colspan=2|Recognizable (Usernames that would make it look like the email came from an official source within the organization named)
|-
|Google
|Registering the name "Google" would allow for communicating on the site (or even outside of it) with a name that appears to be an official Google account. For any of the examples in this section, you would select the names for the same reason. This has been done in the past with both [https://twitter.com/BiIIMurray humorous] and [http://www.chicagotribune.com/bluesky/technology/ct-russian-twitter-account-tennessee-gop-20171018-story.html nefarious] results.
|-
|iPhone
|Many services would mark messages sent from an iOS client on iPhone as "sent from iPhone".
This could make people believe that your messages are sent from an iPhone even if you don't own one.
|-
|Facebook
|Similar to Google above.
|-
|Bitcoin
|One could pose as the Bitcoin Core development group by using this handle and/or scam uninformed users interested in cryptocurrencies.
|-
|Obama
|Impersonating the former president, supposedly to send messages as them to make them seem bad (or not).
|-
|Canada
|Impersonating a whole country might get you in trouble.{{Citation needed}}
|-
|NFL
|The American "National Football League".
|-
|Garfield
|In the original "GMail" service on the Internet, the G stood for "Garfield".
|-
|<Your city>
|Impersonating the official account for your place of residence.
|-
|NASA
|The American "National Aeronautics and Space Administration". Randall worked there as a contract programmer and roboticist.
|-
|<Name of person who runs the service>
|Impersonating the site owner can allow you to gain the trust of users.
|-
!colspan=3|Causing Trouble (Usernames that might cause errors when mixed with the service's back-end code)
|-
|User
|This is usually the default username for a non-administrative account. This may trick a user that this is owned by the operator of the service.
|-
|Username
|See above.
|-
|Name
|See above.
|-
|You
|Many services display "You" as the signed-on user, so naming oneself "You" makes users think that they are you/they are signed on when they aren't.
|-
|Guest
|Attempts to fool users into thinking that they have a guest account.
|-
|Account
|The opposite of "Guest" (someone without an account). However, for someone with an account, their username will usually be displayed. There is an active user named "Account" on Explain XKCD.
|-
!colspan=2|Causing More Trouble
|-
|Admin
|Impersonating to be a system administrator will let someone fool people and cause a lot of trouble. In particular, it could be used to obtain SSL certificates by demonstrating ownership of a supposedly internal address.
|-
|Administrator
|See above.
|-
|System
|Pretending to be a system-controlled account - might give permissions if the server checks by name.
|-
|<Name of service>
|Pretending to be the official account of the service. There are a lot of spammers who did this on Explain XKCD.
|-
|Help
|Pretending to be the help account. This could led to many questions from new users.
|-
|Error
|This may trick users to do what the user says as they could claim that it was a legitimate error.
|-
!colspan=2|Impossible to Say
|-
|Hyphen-Emdash
|Could be read "Hyphen hyphen Em dash" or "Hyphen dash em dash". In addition, in many markup languages (such as the one used by this very wiki) one can create a larger hyphen with some variation of an "&mdash" command, which could theoretically be pronounced "emdash."
|-
|Dash-8hyphen-8
|Could be read "Dash dash eight hyphen dash eight" or "Dash hyphen eight hyphen hyphen eight". "Hyphen eight" sounds like "hyphenate".
|-
|Zero0ne2numeral2
|Could be read "Zero zero one two numeral two" or "Zero zero ne two numeral two" or "Zero oh ne two numeral two".
|-
|KrisasinHemsworth
|This would be confusing to say out loud, as it would sound like the user was saying that their username was "Chris," spelled the same way that famous actor {{w|Chris Hemsworth}} spells his name. However, the actual username uses the name "Kris," spelled a completely different way than Chris Hemsworth's name, and the phrase "as in Hemsworth" being also part of the username, rather than a clarification of the spelling of "Kris" as would be assumed.
|-
|TheWord&Ampersand
|This would also be confusing and difficult to communicate, as anyone trying to read the username to someone else would say "The word ampersand ampersand" which could be interpreted as "ampersand&" or "ampersand ampersand". Having the phrase "the word" in front of a symbol makes it quite difficult to communicate which variation of ampersand (word or symbol) is actually being referred to.
|-
|ZettaWith3Teees 
|Read aloud, this would lead the listener to expect a username of 'Zettta'. Clarifying that "with three tees" is text and not description would in turn make it difficult to explain the spelling of 'Zetta' with two 't's, and 'Teees' with three 'e's.
|-
!colspan=2|Misc
|-
|<Single Letters> and <Single Numbers>
|These are highly valuable. The Twitter handle "@n" for example is constantly bombarded with offers and hacking attempts.
|-
|<Common Words>
|Also highly valuable; overlaps with "Recognizable" and "Causing (more) Trouble".
|-
|<SQL/JS Injection>
|Codes such as "Drop Table" intended to cause errors or even damage the service's back-end code. (See [[327|Comic 327]])
|-
|ASDF and QWERTY
|Since those keys are right next to each other (on English language layouts), they are often typed as placeholders.
|-
|Yes
|This might be a [[Beret Guy]]-esque misunderstanding when filling out the sign up form. When encountering the form field "Username:" someone may type "Yes" (as in "yes, I want a username") instead of specifying it.
|-
|Bot and Computer
|Pretending to be a bot.
|-
|Blocked
|When users get banned or blocked, their name is often replaced by a string like this.
|-
|Deleted
|Some services like Reddit keep up user posts and data after account deletion, marking the content as submitted by the user "[Deleted]" or "Deleted".
|-
|Jeeves
|Might refer to {{w|Ask Jeeves}} (now Ask.com), a Internet Search Engine.
|-
|Narrator
|In books, radio plays and movies it is quite common to have a narrator explain parts of the story. In an online forum however, it is not.{{Citation needed}}
|-
|Internet
|"The Internet" sometimes refers to a large group of users, the collective hive-mind if you will. However, there cannot be a single user account speaking on behalf of them, as they aren't a single entity.
|-
|NPC
|Stands for Non-player character.
|-
|Password
|If the user accidentally typed their password into the username field, this would be the result.
|-
!colspan=2|Permissive Character Sets
|-
|<Space>
|Usernames containing only whitespace can not only be confusing for other people, but often systems 'trim' (remove whitespace at the beginning and end) user input. If the username was only made of spaces, after trimming it would be completely empty, which can cause a whole slew of other problems.
|-
|<nowiki>@ é |</nowiki>
|The @ separates the local part from the domain part of email addresses. If a service decides to create email addresses for their users, they will have a hard time if they allowed the "at" character as part of a username.
é is encoded in many character sets, like Latin-1 and Unicode. In Unicode, it can even be described either "U+00E9 LATIN SMALL LETTER E WITH ACUTE" or as the sequence "U+0065 LATIN SMALL LETTER E" and "U+0301 COMBINING ACUTE ACCENT". If a system uses {{w|Unicode normalization}} after the check if the username is available, this might allow someone to take over someone else's account.
|-
|<nowiki>“ ” " ‘ ’ ' `</nowiki>
|Various quotation marks.
“, ”,‘ and ’ (Unicode quotes): can expose a system's inability to handle multi-byte-encodings. If they are converted to their ASCII counterparts, they might cause code injections.
' and " (ASCII single and double quotes): often used as string delimeter (causing the rest of the name to be interpreted as HTML, or worse, code.
` (ASCII grave / backtick): Sometimes used as string delimeter; Perl (which some websites are still programmed in) executes commands ("shell code") when between backticks.
|-
|<NBSP>
|Unicode character "U+00A0 NO-BREAK SPACE". Similar attack vector as <Space>, but some programming languages will not strip non-ASCII whitespace (therefore the validation will pass).
|-
|<nowiki>\ . #</nowiki>
|The backslash is very often used for "escape sequences", that get expanded to other characters. (\n -> newline, \t -> tab character, \b -> backspace character (deletes the character to its left), etc.)
The period can be problematic in emails. RFC 2822 forbids periods at the beginning or end of the local part or more than one period in a row.
In URLs, the Octothorpe (#) is used as the 'anchor'. Anything following a # will not be transmitted to the server. If a user is named 'logout#blahblah' (which might be a valid username) and the user profile is located at http://example.com/<the_username>, the server might generate the URL http://example.com/logout#blahblah. Since the URL will be truncated at the '#', any user attempting to view this profile will be logged out of the service.
|-
|<RTL override>
|The right to left override is an Unicode character which forces text after it to be laid out right to left. Thus, in left-to-right locales, it flips everything after it. This can be rather amusing if permitted. (See [[1137|Comic 1137]])
|-
|<nowiki>– - _ /</nowiki>
|Includes both the em-dash and the hyphen, which are easily confused and are highly unusual for user names. The forward slash is also the path delimeter for URLs; if user profiles are located at e.g. <nowiki>http://example.com/user/the_username</nowiki>, this can cause obvious issues. Explain XKCD does not allow <code>/</code> in usernames.
|-
|<Any emoji>
|Current databases are not set up to store emojis as characters.
|-
|","
|In CSV files this separates one column or data item from another. This could cause bugs if the usernames are used as part of a CSV file since the next column on the row could be left blank filled with other data.
|-
|<nowiki>&NBSP</nowiki>;
|The special entity in HTML (web page language) for a non-breaking space, or a space that prevents an automatic line-break at its position. When rendered as part of an HTML page without sanitization, this would only display a space.
|-
|<nowiki></HTML></nowiki>
|This is trying to inject code for the web page using the user name. If the user name is not sanitized and does not have special characters encoded, this HTML end tag could end the HTML document, leading to page errors.
|-
|&LT;/HTML&GT;
|&LT; and &GT; are special character entities in HTML that represent < and >, repectively. So all together, when rendered as part of an HTML document, this would print "<nowiki></HTML></nowiki>" Although this would look similar to the previous <nowiki></HTML></nowiki> entry, it would be unlikely to cause problems as the symbols are not interpreted if encoded as special entities.
|-
|OkThisIsKindOfConfusingButIt's <LessThan\ForwardSlashHTML GreaterThanActualGreaterThan Symbol>Yes,ThatWasAllPartOfThe Name,ButSoIs...Ok,LetMeStartOver”
|The abundance of symbols and symbol related worlds and phrases such as ActualGreaterThanSymbol would make this extremely difficult to vocally communicate to another person. This difficulty is further compounded by the parts at the beginning and end, which sound like they are part of the explanation despite being part of the name itself.
|-
|}

==Transcript==
{{incomplete transcript|Layout not standard (eg. indentation) and a short description at the beginning about what is shown should be given.}}
'''Namespace Land Rush Cheat Sheet'''
(Note: if an item is "quoted", it is meant literally, otherwise the reader is supposed to substitute their own information for words in <angle brackets>)

When a new service appears that lets you register a name, here are some you may want to try and get first:

* Straightforward
** <Your usual username, if any>
** <Your given name>
** <Your full name>
** <Initial><Surname>
** <Surname> (Bold & Slightly Unconventional)

* Recognizable
** "Google"
** "iPhone"
** "Facebook"
** "BitCoin"
** "Obama"
** "Canada"
** "NFL"
** "Garfield"
** <Your city>
** "NASA"
** <Name of person who runs the service>

* Causing Trouble
** "User"
** "Username"
** "Name"
** "You"
** "Guest"
** "Account"

* Causing More Trouble
** "Admin"
** "Administrator"
** "System"
** <Name of service>
** "Help"
** "Error"

* Impossible to Say
** "Hyphen-Emdash"
** "Dash-8hyphen-8"
** "Zero0ne2numeral2"
** "KrisasinHemsworth"
** "TheWord&Ampersand"
** "ZettaWith3Teees" 

* Misc
** <Single Letters>
** <Single Numbers>
** <Common Words>
** <SQL/JS Injection>
** "ASDF"
** "QWERTY"
** "Yes"
** "Bot"
** "Computer"
** "Blocked"
** "Deleted"
** "Jeeves"
** "Narrator"
** "Internet"
** "NPC"
** "Password"

* Permissive Character Sets
** <Space>
** <NBSP>
** <RTL override>
** <Any emoji>
** "<nowiki>&NBSP</nowiki>;"
** "<nowiki></HTML></nowiki>"
** "&LT;/HTML&GT;"
** one or more of the following symbols: <nowiki>@ é | “ ” \ . # " ‘ – - _ / ’ ' `</nowiki>
** "," (including quote marks)
** "OkThisIsKindOfConfusingButIt's<LessThan\ForwardSlashHTMLGreaterThanActualGreaterThanSymbol>Yes,ThatWasAllPartOfTheName,ButSoIs...Ok,LetMeStartOver”"

{{comic discussion}}
[[Category:iOS]]

1331: Frequency

2023-04-03T17:18:57Z

LostXOR: Fixed the amount per year for plastic bottles being multiplied by 50,000

{{comic
| number = 1331
| date = February 17, 2014
| title = Frequency
| custom = <center><table title="This comic shows estimated average frequency. I wanted to include the pitch drop experiment, but it turns out the gif format has some issues with decade-long loops."><tr>
<td>[[File:heartbeat.gif]]</td>
<td>[[File:birth.gif]]</td>
<td>[[File:death.gif]]</td>
<td>[[File:wikipedia.gif]]</td>
<td>[[File:vibrator.gif]]</td>
</tr><tr>
<td>[[File:car china.gif]]</td>
<td>[[File:car japan.gif]]</td>
<td>[[File:car germany.gif]]</td>
<td>[[File:car us.gif]]</td>
<td>[[File:car elsewhere.gif]]</td>
</tr><tr>
<td>[[File:kiss.gif]]</td>
<td>[[File:fire dept.gif]]</td>
<td>[[File:holeinone.gif]]</td>
<td>[[File:turnsignal1.gif]]</td>
<td>[[File:turnsignal2.gif]]</td>
</tr><tr>
<td>[[File:earthquake1.gif]]</td>
<td>[[File:earthquake2.gif]]</td>
<td>[[File:earthquake3.gif]]</td>
<td>[[File:earthquake4.gif]]</td>
<td>[[File:parliament toilet.gif]]</td>
</tr><tr>
<td>[[File:flight.gif]]</td>
<td>[[File:book mockingbird.gif]]</td>
<td>[[File:cat mockingbird.gif]]</td>
<td>[[File:phoenixshoes.gif]]</td>
<td>[[File:phoenix.gif]]</td>
</tr><tr>
<td>[[File:keys.gif]]</td>
<td>[[File:amelia.gif]]</td>
<td>[[File:dogbite.gif]]</td>
<td>[[File:bike.gif]]</td>
<td>[[File:eagle.gif]]</td>
</tr><tr>
<td>[[File:bottles.gif]]</td>
<td>[[File:recycled.gif]]</td>
<td>[[File:meteor.gif]]</td>
<td>[[File:oldfaithful.gif]]</td>
<td>[[File:shark.gif]]</td>
</tr><tr>
<td>[[File:us cancer.gif]]</td>
<td>[[File:us cancer death.gif]]</td>
<td>[[File:dog.gif]]</td>
<td>[[File:cat.gif]]</td>
<td>[[File:wedding.gif]]</td>
</tr><tr>
<td>[[File:domain.gif]]</td>
<td>[[File:house.gif]]</td>
<td>[[File:tattoo.gif]]</td>
<td>[[File:pulsar.gif]]</td>
<td>[[File:facebook.gif]]</td>
</tr><tr>
<td>[[File:iphone.gif]]</td>
<td>[[File:littleleague.gif]]</td>
<td>[[File:ndsex.gif]]</td>
<td>[[File:bieber.gif]]</td>
<td>[[File:denverpizza.gif]]</td>
</tr></table></center>
| titletext = This comic shows estimated average frequency. I wanted to include the pitch drop experiment, but it turns out the gif format has some issues with decade-long loops.
}}

==Explanation==
This comic shows a number of common events, arranged in a grid. Each of the events flashes with its average frequency.

For example, statistically a child is born somewhere on the world approximately every 0.24 seconds, or four times per second. Therefore, the tile "One birth" blinks about 4 times per second.

The title text refers to the {{w|Pitch drop experiment}} which measures the flow of a piece of pitch over many years. At room temperature, tar pitch flows at a very slow rate, taking several years to form a single drop. The title text jokes that Randall tried to include a tile that flashes about once every {{w|decade|ten years}}, but the tiles are all {{w|Animated GIF|animated GIFs}} and while the file format supports animations of any length, the resulting file would be too big (at least 10 megabytes).

A thorough analysis of the frequencies present in this comic and how they relate to the underlying technology (the GIF format) was published as [http://notebooks.jsvine.com/reverse-engineering-xkcd-frequency/ Reverse Engineering xkcd's 'Frequency'].

The table below lists all the events and their periods/frequencies (computed from the GIF loop times). Some events make reference to other comics.

===Events===
{| class="wikitable sortable"
!class="unsortable"|Picture
!class="unsortable"|Text
!Period (seconds)
!Frequency (per minute)
!Frequency (per year)
!class="unsortable"|Explanation and/or references to other comics.
|-
|[[File:heartbeat.gif]]
|Heartbeat||style="text-align:right;"|0.86||style="text-align:right;"|70||style="text-align:right;"|33,000,000||The typical resting {{w|heart rate}} in adults is 60–80 beats per minute (bpm).
|-
|[[File:birth.gif]]
|One birth||style="text-align:right;"|0.24||style="text-align:right;"|250||style="text-align:right;"|131,490,000||The {{w|Birth rate|birth rate}} that occurs on Earth.
|-
|[[File:death.gif]]
|One death||style="text-align:right;"|0.56||style="text-align:right;"|107||style="text-align:right;"|56,360,000||The {{w|Mortality rate|Mortality rate}} is much lower than the birth rate shown above; thus, the world's population continues to increase. (Mass deaths not included.)
|-
|[[File:wikipedia.gif]]
|Someone edits Wikipedia||style="text-align:right;"|0.67||style="text-align:right;"|90||style="text-align:right;"|47,100,000||{{w|Wikipedia}} is an online, freely editable encyclopedia. A table recording the time between completion of each block of 10 million edits can be found [http://en.wikipedia.org/wiki/User:Katalaveno/TBE here], which suggests that the value 0.67 Sec/Edit is a little high, with the average being closer to 0.63 Sec/Edit.
|-
|[[File:vibrator.gif]]
|Someone buys a vibrator||style="text-align:right;"|2.99||style="text-align:right;"|20||style="text-align:right;"|10,550,000 || This is just a joke; there are no reliable statistics on worldwide vibrator productions or sales.
|-
|[[File:car china.gif]]
|China builds a car||style="text-align:right;"|1.89||style="text-align:right;"|32||style="text-align:right;"|16,700,000|| According to the International Organization of Motor Vehicle Manufacturers, China is the world's most prolific car manufacturer, producing just over [http://www.oica.net/category/production-statistics/2013-statistics/ 18 million cars in 2013].
|-
|[[File:car japan.gif]]
|Japan builds a car||style="text-align:right;"|4.01||style="text-align:right;"|15||style="text-align:right;"|7,870,000|| According to the International Organization of Motor Vehicle Manufacturers, Japan is the second most prolific car manufacturing country, producing just over [http://www.oica.net/category/production-statistics/2013-statistics/ 8 million cars in 2013].
|-
|[[File:car germany.gif]]
|Germany builds a car||style="text-align:right;"|5.8||style="text-align:right;"|10||style="text-align:right;"|5,440,000|| According to the International Organization of Motor Vehicle Manufacturers, Germany is the third most prolific car manufacturing country, producing nearly [http://www.oica.net/category/production-statistics/2013-statistics/ 5.5 million cars in 2013].
|-
|[[File:car us.gif]]
|The US builds a car||style="text-align:right;"|6.95||style="text-align:right;"|8.6||style="text-align:right;"|4,540,000|| According to the International Organization of Motor Vehicle Manufacturers, the US is the fourth most prolific car manufacturing country, producing just under [http://www.oica.net/category/production-statistics/2013-statistics/ 4.4 million cars in 2013].
|-
|[[File:car elsewhere.gif]]
|Someone else builds a car||style="text-align:right;"|1.03||style="text-align:right;"|58||style="text-align:right;"|30,640,000|| This relates to car manufacture in countries other than those four listed above. According to the International Organization of Motor Vehicle Manufacturers, this total is just under [http://www.oica.net/category/production-statistics/2013-statistics/ 29.4 million cars in 2013].
|-
|[[File:kiss.gif]]
|A European Union resident has their first kiss||style="text-align:right;"|5.53||style="text-align:right;"|11||style="text-align:right;"|5,700,000|| Given that each person can only have their first kiss once, this statistic is tied to the EU birth rate. This [http://epp.eurostat.ec.europa.eu/statistics_explained/index.php/File:Number_of_live_births,_EU-28,_1961%E2%80%932012_(1)_(million)_YB14.png eurostat graph] shows the birth rate in the EU, and if we assume that the majority of people experience their first 'real' kiss at around age 12-16, then the years 1998-2002 are of interest, where the birth rate is fairly stable at just over 5.5 million.
|-
|[[File:fire dept.gif]]
|A US fire department puts out a fire||style="text-align:right;"|23||style="text-align:right;"|2.6||style="text-align:right;"|1,370,000|| The latest available statistics from the US Fire Administration show that in 2011 there were [http://www.usfa.fema.gov/data/statistics/ roughly 1.39 million] reported fires.
|-
|[[File:holeinone.gif]]
|Someone hits a hole-in-one||style="text-align:right;"|180 (3 minutes)||style="text-align:right;"|⅓ (20 per hour)||style="text-align:right;"|175,320||A {{w|hole in one}} is a feat in {{w|golf}} in which the player hits the ball directly from the tee into the cup with one shot. This does not account for the possibility of [https://what-if.xkcd.com/85/ Rocket Golf].
|-
|[[File:turnsignal1.gif]]
|My turn signal blinks||style="text-align:right;"|0.94||style="text-align:right;"|64||style="text-align:right;"|33,638,400||This, together with "The turn signal of the car in front of me blinks", forms a reference to [[165: Turn Signals]].
|-
|[[File:turnsignal2.gif]]
|The turn signal of the car in front of me blinks||style="text-align:right;"|0.9||style="text-align:right;"|67||style="text-align:right;"|35,215,200||This, together with "My turn signal blinks", forms a reference to [[165: Turn Signals]].
|-
|[[File:earthquake1.gif]]
|Earthquake (magnitude 1)||style="text-align:right;"|2.43||style="text-align:right;"|25||style="text-align:right;"|13,000,000||These are continually happening, and not felt by humans. The [http://earthquake.usgs.gov/earthquakes/map/#%7B%22feed%22%3A%221419026358584%22%2C%22sort%22%3A%22newest%22%2C%22mapposition%22%3A%5B%5B-85%2C0%5D%2C%5B85%2C360%5D%5D%2C%22viewModes%22%3A%7B%22help%22%3Afalse%2C%22list%22%3Atrue%2C%22map%22%3Atrue%2C%22settings%22%3Afalse%7D%2C%22autoUpdate%22%3Afalse%2C%22search%22%3A%7B%22id%22%3A%221419026358584%22%2C%22name%22%3A%22Search%20Results%22%2C%22isSearch%22%3Atrue%2C%22params%22%3A%7B%22starttime%22%3A%222014-12-12%2000%3A00%3A00%22%2C%22minmagnitude%22%3A-1%2C%22eventtype%22%3A%22earthquake%22%2C%22endtime%22%3A%222014-12-19%2023%3A59%3A59%22%2C%22maxmagnitude%22%3A1.9%2C%22orderby%22%3A%22time%22%7D%7D%7D USGS does report them], but the link provided was produced at the time this description was written. It can however be updated by the user.
|-
|[[File:earthquake2.gif]]
|Earthquake (magnitude 2)||style="text-align:right;"|24.26||style="text-align:right;"|2.5||style="text-align:right;"|1,300,000|| The US Geological Survey estimates that [http://earthquake.usgs.gov/earthquakes/eqarchives/year/eqstats.php 1.3 million] earthquakes of magnitude 2.0-2.9 occur worldwide each year.
|-
|[[File:earthquake3.gif]]
|Earthquake (magnitude 3)||style="text-align:right;"|242.6 (~4 minutes)||style="text-align:right;"|¼ (15 per hour)||style="text-align:right;"|130,000|| The US Geological Survey estimates that [http://earthquake.usgs.gov/earthquakes/eqarchives/year/eqstats.php 130 thousand] earthquakes of magnitude 3.0-3.9 occur worldwide each year.
Earthquakes below this magnitude pass by largely unnoticed by most people (or [[723|tweeters]]).
|-
|[[File:earthquake4.gif]]
|Earthquake (magnitude 4)||style="text-align:right;"|2426 (40.4 minutes)||style="text-align:right;"|0.025 (1.5 per hour)||style="text-align:right;"|13,000|| The US Geological Survey estimates that [http://earthquake.usgs.gov/earthquakes/eqarchives/year/eqstats.php 13 thousand] earthquakes of magnitude 4.0-4.9 occur worldwide each year.
|-
|[[File:parliament toilet.gif]]
|A member of the UK parliament flushes a toilet||style="text-align:right;"|10.06||style="text-align:right;"|6||style="text-align:right;"|3,140,000||At the time of this comic, there were 1,430 persons assigned to one or other of the two houses of the UK parliament, meaning that Randall inferred an average of 6 flushes per individual per day. Supposing that they sleep for 6-8 hours and get up to go to the toilet once per night, that means that during the rest of the day they are averaging a trip to the toilet every 3.2 to 3.6 hours. This estimate is somewhat on the high side, but members of parliament, particularly members of the Lords, do skew older, and older people tend to use the toilet more.{{Citation needed}}
|-
|[[File:flight.gif]]
|An airline flight takes off||style="text-align:right;"|0.93||style="text-align:right;"|65||style="text-align:right;"|34,000,000|| Research conducted in 2008 by Thomas Ruosch and Dr Karl Rege at [http://www.init.zhaw.ch/index.php?id=9&L=1 Zurich University of Applied Science] plotted the [https://www.youtube.com/watch?v=oR00_uLfGVE 93,000 daily worldwide airline flights].
|-
|[[File:book mockingbird.gif]]
|Someone buys ''To Kill a Mockingbird''||style="text-align:right;"|42.05||style="text-align:right;"|1.4||style="text-align:right;"|750,000||"{{w|To Kill a Mockingbird}}" is a novel by {{w|Harper Lee}}, often an assigned reading in high school. Since 1960 it has sold in the region of [http://www.theguardian.com/books/2010/jul/09/harper-lee-to-kill-a-mockingbird 40 million copies], an average of 740,000 a year.
|-
|[[File:cat mockingbird.gif]]
|Someone's pet cat kills a mockingbird||style="text-align:right;"|1.82||style="text-align:right;"|33||style="text-align:right;"|17,340,000||Whereas the previous item references the well-known book "To Kill a Mockingbird", this one talks about {{w|Mockingbird|mockingbirds}} being literally killed (in this case, by cats). [http://animaldiversity.ummz.umich.edu/accounts/Mimus_polyglottos/ There are 45 million mockingbirds in the world;] this means that according to Randall, cats kill 39% of mockingbirds in one year, i.e. in 2.5 years they are able to kill all mockingbirds (excluding the ones that are born in the meantime).
|-
|[[File:phoenixshoes.gif]]
|Someone in Phoenix buys new shoes||style="text-align:right;"|1.08||style="text-align:right;"|56||style="text-align:right;"|29,200,000||Since {{w|Phoenix metropolitan area|metro Phoenix}} has 4,200,000 inhabitants, according to Randall people in Phoenix buy 7 pairs of shoes per capita per year.
|-
|[[File:phoenix.gif]]
|Someone in Phoenix puts on a condom||style="text-align:right;"|2.05||style="text-align:right;"|29||style="text-align:right;"|15,390,000||Randall probably found the number of Condoms sold in Phoenix and estimated that most of those would be used. Estimates directly from the frequency of intercourse and contraceptive uses would be wildly inaccurate, especially as those statistics count encounters that might need multiple condoms as one instance of intercourse. There are [https://www.birthcontrol.com/condom-use-statistics 450,000,000 Condoms sold in the US each Year.]
|-
|[[File:keys.gif]]
|Someone locks their keys in their car||style="text-align:right;"|2.43||style="text-align:right;"|25||style="text-align:right;"|13,000,000||There does not appear to be any data on this mishap, but a [https://twitter.com/search?q=locked%20keys%20in%20car&src=typd Twitter search] reveals this happens, or people discuss it happening at a high frequency.
|-
|[[File:amelia.gif]]
|A Sagittarius named Amelia drinks a soda||style="text-align:right;"|7.79||style="text-align:right;"|7.7||style="text-align:right;"|4,000,000||Randall Munroe is a [http://blog.xkcd.com/2014/01/31/the-baby-name-wizard/ fan of The Baby Name Wizard] blog and its [http://www.babynamewizard.com Name Voyager] tool which shows that "[http://www.babynamewizard.com/baby-name/girl/amelia Amelia]" has recently exploded in popularity. 
This particular frequency is taken from:
* The number of persons called {{w|Amelia (given name)|Amelia}} ([http://howmanyofme.com/ est. 82,572 people in the U.S.])
* The number of persons born between November 22 and December 22 under the astrological sign of {{w|Sagittarius (astrology)|Sagittarius}} (~1/12th of the population, i.e. approximately 6881 Amelias in the U.S.)
* The frequency of soda (soft drinks) being drunk ([http://www.nationmaster.com/graph/foo_sof_dri_con-food-soft-drink-consumption 216 liters per person per year in the U.S.]).
According to our figures, 6881 Amelias drink 1.44 million liters of soft drinks per year in the United States alone, which means that Randall's figures only account for American Amelias (drinking 355 mL or 12 fl. oz. of soda in each drink).
|-
|[[File:dogbite.gif]]
|A dog bites someone in the US||style="text-align:right;"|7.01||style="text-align:right;"|8.6||style="text-align:right;"|4,500,000|| A [http://www.ncbi.nlm.nih.gov/pubmed/18836045 2008 report] by the Centers for Disease Control concluded that 4.5 million people are bitten by dogs each year.
|-
|[[File:bike.gif]]
|Someone steals a bicycle||style="text-align:right;"|24.93||style="text-align:right;"|2.4||style="text-align:right;"|1,265,000||About half of all people who cycle infrequently have their bikes stolen at some time, but people who cycle every day have a 90% higher chance of bike theft, all according to [http://www.citylab.com/commute/2014/04/these-8-depressing-bike-theft-statistics-show-just-how-bad-problem/8890/ this report] of cyclists in Montreal.
|-
|[[File:eagle.gif]]
|A bald eagle catches a fish||style="text-align:right;"|2.69||style="text-align:right;"|22||style="text-align:right;"|11,700,000||It is estimated that there are 70,000 bald eagles in the world and they eat up to [http://www.hancockwildlife.org/forum/viewtopic.php?showtopic=949 a pound-and-a-half of fish] every day.
|-
|[[File:bottles.gif]]
|50,000 plastic bottles are produced||style="text-align:right;"|1.27||style="text-align:right;"|47||style="text-align:right;"|24,848,504||This fact speaks for itself, but here are some [http://www.banthebottle.net/bottled-water-facts/ alarming facts] about plastic bottle production and usage.
|-
|[[File:recycled.gif]]
|50,000 plastic bottles are recycled||style="text-align:right;"|4.64||style="text-align:right;"|13||style="text-align:right;"|6,801,207||27% of the plastic bottles manufactured get [[885: Recycling|recycled]]
|-
|[[File:meteor.gif]]
|A bright meteor is visible somewhere||style="text-align:right;"|1.15||style="text-align:right;"|52||style="text-align:right;"|27,400,000||This varies based on location, time of day, time of year, weather, personal perception and a number of other factors, but according to [http://www.amsmeteors.org/meteor-showers/meteor-faq/#4 The American Meteor Society], between 2-16 can be seen during the hours before daylight where it would be too bright to see them.
|-
|[[File:oldfaithful.gif]]
|Old Faithful erupts||style="text-align:right;"|5640 (94 minutes)||style="text-align:right;"|0.011 (15 per day)||style="text-align:right;"|5,595||{{w|Old Faithful}} is a geyser in {{w|Yellowstone National Park}} in the US, that tends to erupt every 65 or 91 minutes. XKCD's period of 1h 34m falls between the [https://geysertimes.org/geyser.php?id=Old%20Faithful mean and median of recent Old Faithful eruptions] and corresponds to a [http://geysertimes.org/getSingleEruption.php?id=645135 February 16, 2014 eruption].
|-
|[[File:shark.gif]]
|A fishing boat catches a shark||style="text-align:right;"|0.83||style="text-align:right;"|72||style="text-align:right;"|38,000,000|| [[1326: Sharks]]; Shark populations have experienced severe declines due to fishing impacts both of {{w|shark finning|finning}} and by-catch.
|-
|[[File:us cancer.gif]]
|Someone in the US is diagnosed with cancer||style="text-align:right;"|18.99||style="text-align:right;"|3.2||style="text-align:right;"|1,660,000|| According to the [http://www.cancer.org American Cancer Society], there will be an estimated 1,665,540 new cancer cases diagnosed in the US in 2014.
|-
|[[File:us cancer death.gif]]
|Someone in the US dies from cancer||style="text-align:right;"|54.34||style="text-align:right;"|1.1||style="text-align:right;"|580,000|| According to the [http://www.cancer.org American Cancer Society], in 2014 there will be an estimated 585,720 cancer deaths in the US.
|-
|[[File:dog.gif]]
|Someone adopts a dog from a shelter||style="text-align:right;"|15.6||style="text-align:right;"|3.8||style="text-align:right;"|2,000,000||[http://www.statisticbrain.com/pet-owner-industry-stats/ 10%] of owned dogs were adopted from shelters
|-
|[[File:cat.gif]]
|Someone adopts a cat from a shelter||style="text-align:right;"|21.3||style="text-align:right;"|2.8||style="text-align:right;"|1,500,000||[http://www.statisticbrain.com/pet-owner-industry-stats/ 18%] of owned cats were adopted from shelters
|-
|[[File:wedding.gif]]
|Someone gets married||style="text-align:right;"|0.75||style="text-align:right;"|80||style="text-align:right;"|42,000,000||According to [http://www.statisticbrain.com/marriage-statistics/ this study], there are 2,077,000 marriages in the US every year.
|-
|[[File:domain.gif]]
|Someone registers a domain||style="text-align:right;"|0.64||style="text-align:right;"|94||style="text-align:right;"|49,300,000 ||According to [http://www.dailychanges.com/ Dailychanges.com], about 135,000 domains are registered every day, but this figure fluctuates.
|-
|[[File:house.gif]]
|Someone in the US buys a house||style="text-align:right;"|6.22||style="text-align:right;"|9.6||style="text-align:right;"|5,000,000||According to [http://www.census.gov/construction/nrs/pdf/newressales.pdf The Census Bureau], on average there are 400,000 home purchases in the US each month.
|-
|[[File:tattoo.gif]]
|Someone in the US gets a tattoo||style="text-align:right;"|2.06||style="text-align:right;"|29||style="text-align:right;"|15,300,000||This estimate is probably based on the percentage of people who are tattooed, and not how frequently they purchase one, but the figures [http://theweek.com/article/index/233633/the-tattoo-economy-by-the-numbers here], [http://www.vanishingtattoo.com/tattoo_facts.htm here], and [http://www.statisticbrain.com/tattoo-statistics/ here] add to the credibility of the claim.
|-
|[[File:pulsar.gif]]
|The star PSR J1748-2446AD rotates 1,000 times||style="text-align:right;"|1.4||style="text-align:right;"|42.9||style="text-align:right;"|22,548,240,000 which means 22.5 billion times per year||{{w|PSR J1748-2446ad}} is the fastest spinning {{w|pulsar}} known.
|-
|[[File:facebook.gif]]
|Someone lies about their age to sign up for Facebook||style="text-align:right;"|4.32||style="text-align:right;"|14||style="text-align:right;"|7,300,000||To sign up for Facebook, [https://www.facebook.com/help/210644045634222 the user must claim to be at least 13 years old]. This is a reflection of the U.S. {{w|Children's Online Privacy Protection Act}}.
|-
|[[File:iphone.gif]]
|Someone breaks an iPhone screen||style="text-align:right;"|0.93||style="text-align:right;"|65||style="text-align:right;"|34,000,000||According to a [http://www.cnet.com/news/quarter-of-iphones-have-a-broken-screen-says-new-poll/ CNET report], up to a quarter of iPhones have a broken screen.
|-
|[[File:littleleague.gif]]
|A Little League player strikes out||style="text-align:right;"|1.23||style="text-align:right;"|49||style="text-align:right;"|25,754,400||{{w|Little League Baseball|Little League}} is a system of local youth baseball and softball competitions. A {{w|strikeout}} is a situation in baseball and softball. This figure will be inconsistent throughout the year as baseball is normally not played in the winter.
|-
|[[File:ndsex.gif]]
|Someone has sex in North Dakota||style="text-align:right;"|1.38||style="text-align:right;"|43||style="text-align:right;"|22,900,000||Since {{w|North Dakota}} has 723,000 inhabitants (ranked the 48th state), and if we estimate the sexually active population as 80% (and if ''someone'' means ''a couple)'' this means that people in North Dakota have sex 79.1 times a year. It is estimated that [http://geography.about.com/od/culturalgeography/a/geographyofsex.htm 3.93% of the world population has sex on a given day;] Randall's rate for North Dakota is 17.3% which is not low.
|-
|[[File:bieber.gif]]
|Justin Bieber gains a follower on Twitter||style="text-align:right;"|4.73||style="text-align:right;"|13||style="text-align:right;"|6,670,000|| [[802: Online Communities 2#Twitter Region|802: Online Communities 2]]; {{w|Justin Bieber}} is a Canadian pop music singer whose [https://twitter.com/justinbieber Twitter account] is extremely popular.
|-
|[[File:denverpizza.gif]]
|Someone in Denver orders a pizza||style="text-align:right;"|1.27||style="text-align:right;"|47||style="text-align:right;"|24,800,000|| In 2013, an estimated [http://www.statisticbrain.com/pizza-statistics/ 3 billion] pizzas were sold in the US. With a population of approximately 320 million, this is an average of just over 9 pizzas per person per year. According to the [http://quickfacts.census.gov/qfd/states/08/08031.html 2010 Census], the population of Denver was, rounded, 650,000. The frequency shown equates to over 38 pizzas per person per year, four times the national average. But counting the larger {{w|Denver metropolitan area}}, with a population of 2,890,000, the frequency shown equates to a much more reasonable 8.5 pizzas per person per year
|}

==Transcript==
:[Repetitive events are written in grey and arranged in a grid. Each statement pulses to black and then returns to grey at an interval characteristic of the named event.]

{| style="text-align:center;"
|- style="vertical-align: top; background-color:#eeeeee;"
|Heartbeat (0.86 sec)
|One birth (0.24 sec)
|One death (0.56 sec)
|Someone edits Wikipedia (0.67 sec)
|Someone buys a vibrator (2.99 sec)
|- style="vertical-align: top;"
|China builds a car (1.89 sec)
|Japan builds a car (4.01 sec)
|Germany builds a car (5.8 sec)
|The US builds a car (6.95 sec)
|Someone else builds a car (1.03 sec)
|- style="vertical-align: top; background-color:#eeeeee;"
|A European Union resident has their first kiss (5.53 sec)
|A US fire department puts out a fire (23 sec)
|Someone hits a hole-in-one (180 sec)
|My turn signal blinks (0.94 sec)
|The turn signal of the car in front of me blinks (0.9 sec)
|- style="vertical-align: top;"
|Earthquake (magnitude 1) (2.43 sec)
|Earthquake (magnitude 2) (24.26 sec)
|Earthquake (magnitude 3) (242.6 sec)
|Earthquake (magnitude 4) (2426 sec, 42 min)
|Member of the UK Parliament flushes a toilet (10.06 sec)
|- style="vertical-align: top; background-color:#eeeeee;"
|An airline flight takes off (0.93 sec)
|Someone buys ''To Kill a Mockingbird'' (42.05 sec)
|Someone's pet cat kills a mockingbird (1.82 sec)
|Someone in Phoenix buys new shoes (1.08 sec)
|Someone in Phoenix puts on a condom (2.05 sec)
|- style="vertical-align: top;"
|Someone locks their keys in their car (2.43 sec)
|A Sagittarius named Amelia drinks a soda (7.79 sec)
|A dog bites someone in the US (7.01 sec)
|Someone steals a bicycle (24.93 sec)
|A bald eagle catches a fish (2.69 sec)
|- style="vertical-align: top; background-color:#eeeeee;"
|50,000 plastic bottles are produced (1.27 sec)
|50,000 plastic bottles are recycled (4.64 sec)
|A bright meteor is visible somewhere (1.15 sec)
|Old Faithful erupts (5640 sec, 94 min)
|A fishing boat catches a shark (0.83 sec)
|- style="vertical-align: top;"
|Someone in the US is diagnosed with cancer (18.99 sec)
|Someone in the US dies from cancer (54.34 sec)
|Someone adopts a dog from a shelter (15.6 sec)
|Someone adopts a cat from a shelter (21.3 sec)
|Someone gets married (0.75 sec)
|- style="vertical-align: top; background-color:#eeeeee;"
|Someone registers a domain (0.64 sec)
|Someone in the US buys a house (6.22 sec)
|Someone in the US gets a tattoo (2.06 sec)
|The star ''PSR J1748-2446ad'' rotates 1,000 times (1.4 sec)
|Someone lies about their age to sign up for Facebook (4.32 sec)
|- style="vertical-align: top;"
|Someone breaks an iPhone screen (0.93 sec)
|A little league player strikes out (1.23 sec)
|Someone has sex in North Dakota (1.38 sec)
|Justin Bieber gains a follower on Twitter (4.73 sec)
|Someone in Denver orders a pizza (1.27 sec)
|}

{{comic discussion}}
[[Category:Comics with animation]]
[[Category:Charts]]
[[Category:Sharks]]
[[Category:Romance]]
[[Category:Cancer]]
[[Category:Sex]]
[[Category:Wikipedia]]
[[Category:Baseball]]

2756: Qualifications

2023-03-31T17:00:12Z

LostXOR: Fixed résumé spelling

{{comic
| number = 2756
| date = March 29, 2023
| title = Qualifications
| image = qualifications_2x.png
| imagesize = 265x316px
| noexpand = true
| titletext = 'So how DID you go from working at the employment records office to becoming president of MIT and CEO of IBM?' 'I guess I just have an eye for opportunities.'
}}

==Explanation==
{{incomplete|Created by a 600-YEAR-OLD BOT waiting for a child to be born to accept its work history - Please change this comment when editing this page. Do NOT delete this tag too soon.}}

[[Black Hat]] is being interviewed for some unidentified position. From the conversation, it seems clear that he has used some prior access to the employment records at some employment record office to fraudulently manufacture a history of having worked there for 600 years. There are some institutions that are extant today with over 600 years of history, but, with the exception of some arms of the {{w|Catholic Church}}, none of their individual offices or departments have existed for that long; also, human lifespans rarely exceed 100 years, never mind 600. He also claims an additional pair of prestigious jobs, but it is unclear whether these 'facts' were entirely due to false records or, knowing Black Hat's [[498: Secretary: Part 5|other]] [[1094: Interview|interviews]], briefly true but only as a result of false representation/underhanded actions.

His interviewers, Cueball and Hairbun, are not entirely unaware of the implausibility, but Hairbun, at least, seems content to have just verified the validity of the claim. The 'validation' arises from the clearly tainted information source, given the whole chain of supporting evidence that may have been falsified. This is essentially a more elaborate version of Black Hat's ploy in another interview [[125: Marketing Interview|17 years prior]].

Employers often encounter résumés that have implausibly padded experience claims. Most applicants try not to be this implausible, and few employers are so credulous as to take self-supporting lies at face value.

[[:Category:Job interviews|Job interviews]] are a recurring topic on xkcd.

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}

:[Black Hat sits in an office chair. Cueball, facing him, sits on another office chair at his desk and Hairbun stands behind him. Cueball is holding documents in his hands.]
:Cueball: Impressive résumé.
:Cueball: It says that you have over '''''six hundred''''' years of experience at the employment records office? That can't be right.
:Hairbun: I thought so too, but it checks out.

{{comic discussion}}

[[Category:Comics featuring Black Hat]]
[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Hairbun]]
[[Category:Job interviews]]

Main Page/sandbox

2023-03-28T19:29:59Z

LostXOR: Just saying hi :)

If you get to this sandbox page, say hi! —[[User:EnderPlays|EnderPlays]] October 11, 2022
:Hi —[[User:While False|While False]] ([[User:While False/explain xkcd museum|'''museum''']] | [[User talk:While False|talk]] | [[special:Contributions/While_False|contributions]] | [[special:Log/While_False|logs]] | [[Special:UserRights/While_False|rights]]) {{CURRENTTIME}}, {{CURRENTDAY}} {{CURRENTMONTHNAME}} {{CURRENTYEAR}} (UTC)
:Hi
:Hi! [[User:Netherin5|“That Guy from the Netherlands”]] ([[User talk:Netherin5|talk]]) {{CURRENTTIME}}, {{CURRENTDAY}} {{CURRENTMONTHNAME}} {{CURRENTYEAR}} (UTC)
:Hi! {{User:PoolloverNathan/Signature}} {{CURRENTTIME}}, {{CURRENTDAY}} {{CURRENTMONTHNAME}} {{CURRENTYEAR}} (UTC)
:hi! [[User:JLZ0kTC5|JLZ0kTC5]] ([[User talk:JLZ0kTC5|talk]]) {{CURRENTTIME}}, {{CURRENTDAY}} {{CURRENTMONTHNAME}} {{CURRENTYEAR}} (UTC)
:Hi! [[Special:Contributions/172.69.68.22|172.69.68.22]] {{CURRENTTIME}}, {{CURRENTDAY}} {{CURRENTMONTHNAME}} {{CURRENTYEAR}} (UTC)Bumpf
:Hi again? Random is [[Special:Random|weird]]. {{User:PoolloverNathan/Signature}} 14:24, 14 November 2022 (UTC)
:Yea, random brought me back here too lol. {{User:EnderPlays}} 01:43, 17 November 2022 (UTC)
:Hi! [[Special:Contributions/162.158.2.46|162.158.2.46]] 20:42, 6 December 2022 (UTC)
Hi [[Special:Contributions/172.70.230.159|172.70.230.159]] {{CURRENTTIME}}, {{CURRENTDAY}} {{CURRENTMONTHNAME}} {{CURRENTYEAR}} (UTC)
Hi!
:Hi, random is fun. --RandomInternetViewer {{CURRENTTIME}}, {{CURRENTDAY}} {{CURRENTMONTHNAME}} {{CURRENTYEAR}} (UTC)
:Hi. Got here from random :) {{CURRENTTIME}}, {{CURRENTDAY}} {{CURRENTMONTHNAME}} {{CURRENTYEAR}} (UTC) -[[User:Theunlucky|Theunlucky]] ([[User talk:Theunlucky|talk]]) 21:04, 15 December 2022 (UTC)
Hi people [[Special:Contributions/162.158.146.209|162.158.146.209]] {{CURRENTTIME}}, {{CURRENTDAY}} {{CURRENTMONTHNAME}} {{CURRENTYEAR}} (UTC)

Hello from very slightly in the future! [[Special:Contributions/172.70.162.56|172.70.162.56]] {{#time:H:i, d F Y (e)|+1 minute}}

Hi! [[User:WhatDoWeDoNow|WhatDoWeDoNow]] (visited Jan 17th, 2023)

:Hi!
Hello, future (and past) sandbox visitors! I got here from random too. :) [[User:LostXOR|LostXOR]] 2023-03-28

2754: Relative Terms

2023-03-27T18:06:35Z

LostXOR: Added explanations for blender, fire alarm, statue, and volcano

{{comic
| number = 2754
| date = March 24, 2023
| title = Relative Terms
| image = relative_terms_2x.png
| imagesize = 425x442px
| noexpand = true
| titletext = Small sewing machines are sewing machines that are smaller than a sewing machine. A sewing machine is larger than a small sewing machine, but quieter than a loud sewing machine.
}}

==Explanation==
{{incomplete|Created by a BOT THAT IS LARGER THAN A BOT - Please change this comment when editing this page. Do NOT delete this tag too soon.}}
The terms "small" and "big" are used to refer to size; the terms "loud" and "quiet" are used to refer to (audial) volume.

While these terms are relative, they are often used even when there is nothing obvious being compared against (e.g. "A windmill is a big thing" or "An ant is a small thing"). This comic humorously suggests that the item defined to be in the middle of all four terms ("neither small nor big; neither quiet nor loud") is a sewing machine, as a sewing machine seems (at least in comparison to the other items on the graph) to be neither particularly big nor particularly small, neither particularly quiet nor particularly loud.

An alternative argument may be that the in the centre would be the average adult human (as this is the perspective from which most people use language), though this observation would lose some of the comic's comedic value.

The center of the chart is a sewing machine, and the comic is claiming that the scales of "loud and quiet" and "big and small" are measured in comparison to a standard size sewing machine. A standard sewing machine is roughly 60dB in volume and approximately 42” X 21”, although this is for industrial machines, and those in the home would be both smaller and quieter.

The title text is humorously tautological because it compares the standard against those things that are themselves defined against the standard.

{| class="wikitable"
|+ Small and quiet (upper left)
|-
! Item !! Description
|-
| Ant ||
|-
| Balloon ||
|-
| Book ||
|-
| Bun (rabbit or pastry) || "Bun" is an informal term for a rabbit and a loaf of bread, this comparison was made in [[1871: Bun Alert]]
|-
| Butterfly || This entry is found on the top left corner, corresponding to the extremes of quietness and smallness. Butterflies are small and make little noise.
|-
| Hat ||
|-
| Mouse || A mouse is a very small, quiet animal. This might also be a reference to the expression "quiet as a mouse", meaning very quietly.
|-
| Newt ||
|-
| Pin drop || The expression "hear a pin drop" is used to indicate that an area is exceptionally quiet; the idea is that the space is so silent that even something as insubstantial and tiny as a pin can be heard hitting the ground.
|-
| Snow globe || A {{w|snow globe}} is much smaller than a sewing machine. Some snow globes have a small music box that can be wound up to play a melody. Snow globes without a music box are silent.
|}

{| class="wikitable"
|+ Small and loud (upper right)
|-
! Item !! Description
|-
| Baby || Babies are usually considered small, and can be quite loud when they cry.
|-
| Blender || Blenders make a lot of noise when in use. Most household blenders are smaller than a sewing machine.
|-
| Cricket || Top right corner. This would refer to the insect, which is pretty small and can be quite loud; the sport of cricket or a cricket game would be much larger and potentially much louder.
|-
| Fire alarm || The primary purpose of a fire alarm is to notify people of fire, so fire alarms are usually very loud.
|-
| Firecracker || A {{w|Firecracker}} is a small explosive firework that makes a very loud bang when lit.
|-
| Flute ||
|-
| Harmonica ||
|-
| Popcorn ||
|-
| Songbird ||
|-
| Whistle || This is of course the device known as a whistle, as it is small. The act by humans to whistle has no size. A whistle is used functionally in place of a human that wisthles. The loudest human whistle ever recorded was 8372 Hz and roughly 110 DB, which is a C9 in the standard musical scale and is roughly as loud as a jackhammer[https://www.vnews.com/West-Lebanon-man-sets-a-world-record-for-whistling-24480844#:~:text=Guinness'%20website%20says%20Stanford%20reached,in%20the%20standard%20musical%20notation.]. Since a whistle should be able to beat this it must be seen as loud.
|}

{| class="wikitable"
|+ Big and quiet (lower left)
|-
|-
! Item !! Description
|-
| Anaconda ||
|-
| Giraffe || Giraffes can be quite loud, but they usually vocalise using frequencies well below the range of human hearing. So, to a human, giraffes are quiet.
|-
| Northern lights || "In 2016, a Finnish study confirmed that the Aurora Borealis does produce a sound that can be heard" [https://www.techexplorist.com/listen-sound-aurora-borealis/47421/]
|-
| Shark ||
|-
| Statue || Most statues are larger than a sewing machine. Most statues are silent, but some have fountains or other devices that make sound.
|-
| The Moon || Lower left corner; the Moon is very, very big{{fact}}, but it is also completely silent as sound cannot travel through the vacuum of space.
|-
| Tree ||
|-
| Windmill ||
|}

{| class="wikitable"
|+ Big and loud (lower right)
|-
! Item !! Description
|-
| Airplane ||
|-
| Cannon ||
|-
| Riding mower ||
|-
| [[wikipedia:Calliope_(music)|Steam calliope]] || A large musical device which functions by sending steam (or more recently compressed air) through attached whistles.
|-
| Train ||
|-
| Tuba ||
|-
| Volcano || Lower right corner. Volcanic eruptions can be extremely loud. The {{w|1883 eruption of Krakatoa}} made a pressure wave of 180 dB, the loudest sound ever recorded.
|-
| Waterfall ||
|-
| Whale ||
|}

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}

:[A chart, with "Quiet" to "Loud" on the X-axis, and "Small" to "Big" on the Y-axis. It is split into four quarters, with "Sewing machine" in the center.]

:[Upper left quadrant (Small & Quiet items):] Butterfly, Pin drop, Mouse, Ant, Bun (rabbit or pastry), Snow globe, Newt, Balloon, Book, Hat

:[Upper right quadrant (Small & Loud items):] Popcorn, Cricket, Songbird, Whistle, Baby, Harmonica, Flute, Fire alarm, Blender, Firecracker

:[Lower left quadrant (Big & Quiet items):] Shark, Tree, Anaconda, Giraffe, Statue, Windmill, Northern lights, The Moon

:[Lower right quadrant (Big & Loud items):] Tuba, Riding mower, Cannon, Airplane, Train, Waterfall, Steam calliope, Whale, Volcano

:[Caption below the panel:]
:''Big'', ''Small'', ''Loud'', and ''Quiet'' are relative terms. The thing they're relative to is a sewing machine.

{{comic discussion}}

[[Category:Charts]]
[[Category:Aviation]]
[[Category:Animals]]
[[Category:Buns]]
[[Category:Sharks]]
[[Category:Music]]
[[Category:Volcanoes]]
[[Category:Food]]

2754: Relative Terms

2023-03-27T13:27:07Z

LostXOR: Added explanations for baby and mouse

{{comic
| number = 2754
| date = March 24, 2023
| title = Relative Terms
| image = relative_terms_2x.png
| imagesize = 425x442px
| noexpand = true
| titletext = Small sewing machines are sewing machines that are smaller than a sewing machine. A sewing machine is larger than a small sewing machine, but quieter than a loud sewing machine.
}}

==Explanation==
{{incomplete|Created by a BOT THAT IS LARGER THAN A BOT - Please change this comment when editing this page. Do NOT delete this tag too soon.}}
The terms "small" and "big" are used to refer to size; the terms "loud" and "quiet" are used to refer to (audial) volume.

While these terms are relative, they are often used even when there is nothing obvious being compared against (e.g. "A windmill is a big thing" or "An ant is a small thing"). This comic humorously suggests that the item defined to be in the middle of all four terms ("neither small nor big; neither quiet nor loud") is a sewing machine.

The center of the chart is a sewing machine, and the comic is claiming that the scales of "loud and quiet" and "big and small" are measured in comparison to a standard size sewing machine. A standard sewing machine is roughly 60dB in volume and approximately 42” X 21”, although this is for industrial machines, and those in the home would be both smaller and quieter.

The title text is humorously tautological because it compares the standard against those things that are themselves defined against the standard.

{| class="wikitable"
|+ Small and quiet (upper left)
|-
! Item !! Description
|-
| Ant ||
|-
| Balloon ||
|-
| Book ||
|-
| Bun (rabbit or pastry) || "Bun" is an informal term for a rabbit and a loaf of bread, this comparison was made in [[1871: Bun Alert]]
|-
| Butterfly || This entry is found on the top left corner, corresponding to the extremes of quietness and smallness. Butterflies are small and make little noise.
|-
| Hat ||
|-
| Mouse || A mouse is a very small, quiet animal. This might also be a reference to the expression "quiet as a mouse", meaning very quietly.
|-
| Newt ||
|-
| Pin drop || The expression "hear a pin drop" is used to indicate that an area is exceptionally quiet; the idea is that the space is so silent that even something as insubstantial and tiny as a pin can be heard hitting the ground.
|-
| Snow globe ||
|}

{| class="wikitable"
|+ Small and loud (upper right)
|-
! Item !! Description
|-
| Baby || Babies are usually considered small, and can be quite loud when they cry.
|-
| Blender ||
|-
| Cricket || Top right corner. This would refer to the insect, which is pretty small and can be quite loud; the sport of cricket or a cricket game would be much larger and potentially much louder.
|-
| Fire alarm ||
|-
| Firecracker || A {{w|Firecracker}} is a small explosive firework that makes a very loud bang when lit.
|-
| Flute ||
|-
| Harmonica ||
|-
| Popcorn ||
|-
| Songbird ||
|-
| Whistle || This is of course the device known as a whistle, as it is small. The act by humans to whistle has no size. A whistle is used functionally in place of a human that wisthles. The loudest human whistle ever recorded was 8372 Hz and roughly 110 DB, which is a C9 in the standard musical scale and is roughly as loud as a jackhammer[https://www.vnews.com/West-Lebanon-man-sets-a-world-record-for-whistling-24480844#:~:text=Guinness'%20website%20says%20Stanford%20reached,in%20the%20standard%20musical%20notation.]. Since a whistle should be able to beat this it must be seen as loud.
|}

{| class="wikitable"
|+ Big and quiet (lower left)
|-
|-
! Item !! Description
|-
| Anaconda ||
|-
| Giraffe || Giraffes can be quite loud, but they usually vocalise using frequencies well below the range of human hearing. So, to a human, giraffes are quiet.
|-
| Northern lights || "In 2016, a Finnish study confirmed that the Aurora Borealis does produce a sound that can be heard" [https://www.techexplorist.com/listen-sound-aurora-borealis/47421/]
|-
| Shark ||
|-
| Statue ||
|-
| The Moon || Lower left corner; the Moon is very, very big{{fact}}, but it is also completely quiet because sound cannot travel through the vacuum of space.
|-
| Tree ||
|-
| Windmill ||
|}

{| class="wikitable"
|+ Big and loud (lower right)
|-
! Item !! Description
|-
| Airplane ||
|-
| Cannon ||
|-
| Riding mower ||
|-
| [[wikipedia:Calliope_(music)|Steam calliope]] || A large musical device which functions by sending steam (or more recently compressed air) through attached whistles.
|-
| Train ||
|-
| Tuba ||
|-
| Volcano || Lower right corner
|-
| Waterfall ||
|-
| Whale ||
|}

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}

:[A chart, with "Quiet" to "Loud" on the X-axis, and "Small" to "Big" on the Y-axis. It is split into four quarters, with "Sewing machine" in the center.]

:[Upper left quadrant (Small & Quiet items):] Butterfly, Pin drop, Mouse, Ant, Bun (rabbit or pastry), Snow globe, Newt, Balloon, Book, Hat

:[Upper right quadrant (Small & Loud items):] Popcorn, Cricket, Songbird, Whistle, Baby, Harmonica, Flute, Fire alarm, Blender, Firecracker

:[Lower left quadrant (Big & Quiet items):] Shark, Tree, Anaconda, Giraffe, Statue, Windmill, Northern lights, The Moon

:[Lower right quadrant (Big & Loud items):] Tuba, Riding mower, Cannon, Airplane, Train, Waterfall, Steam calliope, Whale, Volcano

:[Caption below the panel:]
:''Big'', ''Small'', ''Loud'', and ''Quiet'' are relative terms. The thing they're relative to is a sewing machine.

{{comic discussion}}

[[Category:Charts]]
[[Category:Aviation]]
[[Category:Animals]]
[[Category:Buns]]
[[Category:Sharks]]
[[Category:Music]]
[[Category:Volcanoes]]
[[Category:Food]]

2338: Faraday Tour

2023-03-23T13:31:58Z

LostXOR: Wired internet works through Faraday cages

{{comic
| number = 2338
| date = July 27, 2020
| title = Faraday Tour
| image = faraday_tour.png
| titletext = I asked them if it was safe to be running tours during the pandemic. They said, "During the what?"
}}

==Explanation==
This comic is another in a [[:Category:COVID-19|series of comics]] related to the {{w|COVID-19 pandemic}}.

[[Hairy]], addressing an unseen camera (possibly the reader's POV) welcomes viewers to a {{w|Live streaming|livestream}} broadcast - that he calls/brands as a 'Livecast' - walking through "the world's largest {{w|Faraday cage}}." A Faraday cage blocks {{w|Electromagnetic field|electromagnetic transmission}} into and out of the cage area. Attempting to broadcast a walk through such a cage with any medium that uses radio waves would (theoretically, at least) cause the transmitter's signal to drop out completely, resulting in the loading wheel shown in panels three and four. Faraday cages do not necessarily have to be dark inside, as this one appears to be (they typically block longer wavelengths than those of visible light, which consists of electromagnetic waves). However, the darkness visually aligns with the concept of {{w|communications blackout}}, which is what Hairy's viewers experience while Hairy is in the cage. The darkness could be taken as a metaphor for depending so heavily on electronic connectivity for one's view of the world that anything not directly connected is conceived as unobservable. (Alternatively, the light switch could be inside the cage.)

The Faraday cage that Hairy is visiting may also be an {{w|anechoic chamber}} for testing radio equipment, which would be completely lined with {{w|radiation-absorbent material}}, not just an open-air cage, to ensure that the measurements inside are of the highest quality. There's no particular reason that it would have to have the lights off for his tour (in fact, it would be better to have the lights on so that he could see the features inside),{{Citation needed}} but some anechoic chambers have been used for [https://www.zdnet.com/article/quietest-place-on-earth-causes-hallucinations/ sensory deprivation experiments], in which participants are shut inside in total darkness and quiet.

"Smash that like (or subscribe, etc.) button" is a typical command given by YouTubers to watchers, asking to publicly "like" the video or subscribe to their channel if they enjoyed it, ultimately to boost the creator's popularity. Developers want lots of views, likes, and subscribes because YouTube pays artists (e.g. $1 per 1000 views).

The title text refers to COVID-19 pandemic of 2020. The joke is that, as they don't get cell service in the cage, the owners would be unaware of global events. This implies for comedic effect that the owners and workers solely live inside the Faraday cage, continuing the theme of treating connectivity as the only way to acquire information. They would still be able to receive news if they ever step outside to welcome visitors, have print media delivered, or have a wired internet connection, but their choice to unconventionally isolate themselves might reflect their general attitudes to the world outside and it is also implied that Hairy is one of the rare few outsiders they have pre-agreed to allow to visit, or one of the few people who would think to ask for and plan a tour during a pandemic.

Randall has referenced Faraday cages for comedic effect in the past. See [[1142: Coverage]].

==Transcript==
:[Close-up on Hairy]
:Hairy: Hey there superfans, welcome to the livecast!

:[Hairy walks toward an opening in a large building]
:Hairy: Got a real treat for you today: a tour of the world's largest Faraday cage!
:Hairy: C'mon, let's check it-

:[Two panels of a "loading" spinner on a black background]

:[Hairy exits the building]
:Hairy: -was ''so cool!'' Wow!!
:Hairy: Thanks for coming along, and don't forget to smash that like button!

{{comic discussion}}

[[Category:COVID-19]]
[[Category:Comics featuring Hairy]]
[[Category:Physics]]

2261: Worst Thing That Could Happen

2023-03-21T17:57:33Z

LostXOR: A software update wouldn't emit a "weird frequency" making the supervolcano's lava rise.

{{comic
| number = 2261
| date = January 29, 2020
| title = Worst Thing That Could Happen
| image = worst_thing_that_could_happen.png
| titletext = Before I install any patch, I always open the patch notes and Ctrl-F for 'supervolcano', 'seagull', and 'garbage disposal', just to be safe.
}}

==Explanation==

[[Ponytail]] and her friends are considering upgrading some part or program of their computers. They may feel the need to upgrade because the software they are currently using has some vulnerability that is only patched in newer revisions (this comic was released just two weeks after the [https://www.microsoft.com/en-US/windows/windows-7-end-of-life-support-information end of extended support] for {{w|Windows 7}}), or because they want to have access to some new feature. As part of the decision-making process, Ponytail asks her friends, "What's the worst that could happen?" If the computers they are discussing are privately owned, she may be concerned about losing personal data or having to learn new software interfaces. On the other hand, if they are discussing a corporate computer system, there may also be business-related risks. If their company relies on functionality offered by their current system that has been deprecated or modified in the updated version (such as in [[1172: Workflow]], or as with many specialized tools or machines in the real world), they may suffer downtime while they modify the rest of their workflow. Even if the upgraded system should continue to fit their needs, they may need to take some downtime to perform the update and deal with the risks of something going badly along the way, and there may be major costs associated with license subscriptions and support contracts. "What's the worst that could happen?" is also a common {{w|rhetorical question}}; Ponytail may be expressing a belief that nothing bad could happen as a result of the upgrade, and not expecting an answer.

Unfortunately, Ponytail's friends answer with their ideas for the worst things that could happen ''ever'', not ''as a result of the upgrade'', as Ponytail meant, or they are taking the question to the logical extreme and invoking {{w|chaos theory}}. The result is a list of "worst things" ridiculously unconnected to a computer upgrade. At the end, however, [[Megan]] interprets these as possible results of the upgrade, and advises against upgrading. A [[#List of worst things|list with explanations]] can be found below. Ponytail facepalms at her friends' overly-literal senses of humor.

Alternatively, Ponytail could be facepalming at the fact that the worst thing which could happen, according to her team, is that they are put on a ridiculous game show in which, if they answer a question incorrectly, they are chucked in garbage disposal. This may be bad, but it is nowhere near as bad as an erupting supervolcano or nuclear war.{{Citation needed}} However, [[Cueball]] has shown anxiety and difficulties in social situations, such as the less-than-helpful advice in [[1917: How to Make Friends]], so he (and likewise [[Hairy]] and Megan) may consider that embarrassment on the game show (which might then be immortalized online) is worse than instantaneous death in a nuclear war.

Megan and Cueball have previously experienced a severely-botched upgrade in [[349: Success]], in which Cueball somehow caused them to end up in shark-infested waters off the coast of a deserted island when he was just trying to get their computer to dual-boot BSD.

The title text talks about searching upgrade release notes for some of the things listed to be sure none are potential side effects of an upgrade. "Ctrl-F" is a common keyboard shortcut for "find text string" in many programs. Since Randall is just reading but not changing the patch notes, a web browser, PDF viewer, or word processing program such as Adobe Reader or Microsoft Word might have been used.

===List of worst things===
*The list of "worst things that could happen" discussed by the team are:

{| border =1 width=100% cellpadding=5 class="wikitable"
|'''Thing''' || '''Notes'''
|-
|"{{w|Supervolcano}}." || A supervolcano is a volcano that would (or does) eject over 1,000 cubic kilometers of material when it erupts. The United States in particular is home to a supervolcano in {{w|Yellowstone National Park}}. When it erupts, the results will be catastrophic to the entire world, possibly triggering a volcanic winter, massive crop die-offs (and subsequent cascading extinctions up the food chain), and the destruction of human civilization. This probably would not be set off by any sort of software update.{{Citation needed}}
|-
|"{{w|Robot uprising}}." || An artificial intelligence overthrows humanity and takes over the world. Hairy is probably concerned with a violent uprising in which the robots are determined to exterminate humanity, as in, for example, the {{w|Terminator (franchise)|''Terminator''}} films, rather than [[1450: AI-Box Experiment|an AI who just wants to stay in a box]]. Randall has written about robot uprisings (both violent and humorous) in [[:Category:Artificial Intelligence|several comic strips]]. If Ponytail's company is involved in artificial intelligence, a robot uprising could be a remotely plausible worst-case scenario from a botched upgrade.
|-
|"Everyone falls down a {{w|well}} at once." || There have been several well-publicized incidents in which a real person fell down a well, such as [https://www.biography.com/personality/baby-jessica Baby Jessica] and [https://www.michigan.gov/egle/0,9429,7-135-3313_3675_3689-7996--,00.html this list]. If ''everyone'' fell down a well at once, there would be nobody to get them out, which would be a pretty bad thing. It's unclear how this upgrade could cause this outcome, making this suggestion preposterous.
|-
|"Instead of hitting the tallest thing around, lightning starts hitting the nicest." || {{w|Lightning}} generally strikes the tallest object under a thunderstorm, a topic addressed in {{what if|16|''What-if #16: Lightning''}}. {{w|Lightning rods}} are built to take advantage of this effect to protect nearby important objects from the lightning. If lightning started hitting the ''nicest'' thing around, then it would presumably strike whatever it was that the lightning rods are meant to protect (nice buildings, nice people, [https://history.nasa.gov/SP-350/ch-7-3.html nice rockets]). If the computer that's being upgraded is connected to the [[1620: Christmas Settings|Universe Control Panel]], this change could be a plausible negative consequence of the update.
|-
|"{{w|Seagulls}} all get {{w|handguns}}." || Guns in the hands of humans account for the large majority of homicides and suicides in the USA. Letting handguns be wielded by seagulls, which lack the impulse control and cognitive thinking required to make the ownership of a handgun somewhat safe, would make this much worse. Seagulls are not particularly known for their intelligence, self control, or kindness toward others. At popular beaches, seagulls are known to aggressively harass humans for their food; if they wielded handguns, a great deal of violence would ensue. Even if mayhem and death were not due to intentional use (i.e., if the seagulls were capable of learning that use of a handgun would get them food or something else they might like), they would happen from accidental use.
|-
|"A really '''''slow''''' nuclear war." || No {{w|nuclear war}} involving two sides launching nuclear weapons at each other has ever been fought, but experts generally agree that an all-out nuclear war between superpowers would end very quickly and very badly for all parties involved (as well as all parties not involved). A "slow" nuclear war might play out as a series of tit-for-tat individual launches rather than a single apocalyptic exchange, but the destruction of cities and release of fallout would be the same. Perhaps the anticipation of when exactly it's "your turn" to be a target would make the slow war a worse experience.

Much of the computer networking technology used today has its roots in research into hardening nuclear command and control systems against an incoming first strike, and many works of fiction have depicted nuclear war (or the risk of nuclear war) resulting from computer and software errors in systems that are supposed to "upgrade" the decision-making process, such as ''{{w|WarGames}}'' and "{{w|Fail-Safe (novel)|Fail-Safe}}". If Ponytail's company is involved in the defense industry, a nuclear war could be a plausible worst-case scenario from a botched upgrade.
|-
|"We have to go on a game show where they show you photos of people you've met once and ask you their names, and if you get one wrong a trapdoor opens and you fall into a garbage disposal." || The premise of this game show seems to play on Munroe's frequent references to anxiety about social situations. For people who have troubles remembering names, encountering someone you've met once before can be harrowing, as you may know that you ''should'' know their name, but be unable to recall it, creating embarrassment and awkwardness (particularly if the person remembers your name with ease). The concept is that fear could be exploited in the form of a game show. Many popular game shows feature contests where contestants who fail are subjected to pain and/or humiliation, such as the ''{{w|Ninja Warrior}}'' franchise. This case is particularly exaggerated, as the inability to remember even a single name would result in being dropped into a garbage disposal, which would virtually guarantee serious maiming and/or death. The reaction of the strip characters suggests that they all share a lack of confidence in their ability to remember the names of casual acquaintances, making such a game show one of the "worst things" they could encounter.
|}

==Transcript==
:[Ponytail is standing in front of a desk with a computer. One of her hands is on the keyboard. Behind her, Cueball, Hairy, and Megan are looking at the computer screen.]
:Ponytail: We should upgrade. What's the worst that could happen?
:Cueball: Supervolcano.
:Hairy: Robot uprising.
:Megan: Everyone falls down a well at once.

:[Zoom in on Cueball, Hairy, and Megan. Cueball has turned toward the other two.]
:Cueball: Instead of hitting the tallest thing around, lightning starts hitting the nicest.
:Megan: Seagulls all get handguns.
:Hairy: A really '''''slow''''' nuclear war.

:[Large panel with the original setting. Ponytail has turned towards the other three but is now facepalming, as Cueball gesturing with his hands at chest-height are still looking at the other two facing him.]
:Cueball: We all have to go on a game show where they show you photos of people you've met once and ask you their names, and if you get one wrong a trapdoor opens and you fall into a garbage disposal.
:Hairy: '''Ooh,''' that's a good one.
:Megan: Yeah, let's put off the upgrade.

{{comic discussion}}

[[Category:Comics featuring Ponytail]]
[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Hairy]]
[[Category:Comics featuring Megan]]
[[Category:Computers]]
[[Category:Volcanoes]]
[[Category:Robots]]
[[Category:Artificial Intelligence]]
[[Category:Weather]]
[[Category:Animals]]
[[Category:Nuclear weapons]]