explain xkcd - User contributions [en]

Talk:1167: Star Trek into Darkness

2016-06-12T19:30:03Z

108.162.221.91:

There has been a considerable amount of dance-off as to whether the title of this movie should have a colon in it, which would have appeared as "Star Trek: Into Darkness." They eventually decided against the colon, and I wonder if this comic is poking fun at that dance-off.[[Special:Contributions/169.234.40.187|169.234.40.187]] 00:49, 31 January 2013 (UTC)

I suspect an allusion to movie title spellings that can be seen on moviez sites, torrent sites etc. -- [[Special:Contributions/193.174.118.70|193.174.118.70]] 08:20, 30 January 2013 (UTC)

The Associated Press style manual says to capitalize all prepositions that are four letters or more in titles, e.g. Into, Through, etc. --[[User:Prooffreader|Prooffreader]] ([[User talk:Prooffreader|talk]]) 09:54, 30 January 2013 (UTC)

This could also have to do with WP's MOS of capitalizing "The first word in a compound preposition (e.g. "Time Out of Mind", "Get Off of My Butt")".

However, you cannot simply change the title of a page on WP. This requires actually moving the whole page. [[Special:Contributions/84.208.51.23|84.208.51.23]] 14:02, 30 January 2013 (UTC)

I think there is a capitalization error in the comic. The second to last 's' should be capitalized in order to match the rest of the pattern in "xX_StAr TrEk InTo DaRkNess_Xx". Unless the author is trying to subtly troll us into arguing about that capitalization... [[User:Sayno2quat|Sayno2quat]] ([[User talk:Sayno2quat|talk]]) 14:31, 30 January 2013 (UTC)
:Non-sense, double consonants should never be capitalized! Unless of course you want to use them for structural purposes, like spacing or framing, obviously.--[[User:Pnariyoshi|Pnariyoshi]] ([[User talk:Pnariyoshi|talk]]) 15:05, 30 January 2013 (UTC)

I believe Cueball's comment, "I have a new favorite edit war," is refering to the title text in this comic http://xkcd.com/878 about the great dance-off of HO vs. H0. [[Special:Contributions/206.39.12.245|206.39.12.245]] 15:23, 30 January 2013 (UTC)Pat

"Magnificient"?

The actual [http://en.wikipedia.org/wiki/Talk:Star_Trek_into_Darkness#xkcd_Mention Talk Page] of the Wikipedia article in question has an item about this comic. --[[User:Prooffreader|Prooffreader]] ([[User talk:Prooffreader|talk]]) 16:32, 30 January 2013 (UTC)
:Oh sweet mother of god. Between that and the spam on this wiki, I think I'll take the spam. '''[[User:Davidy22|Davidy22]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 11:33, 31 January 2013 (UTC)

I spent a good portion of last night reading through Wikipedia's talk pages for that. Worth a good laugh. [[Special:Contributions/76.122.5.96|76.122.5.96]] 16:56, 30 January 2013 (UTC)

Well it obviously should be capitalized. --[[User:Shine|Shine]] ([[User talk:Shine|talk]]) 17:43, 30 January 2013 (UTC)

:I tried to make a point on wikipedia that Wikipedia itself went out of its way to create a "lowercase first letter" template so that iPod and things of that nature could be capitalized the way the producer styled it, but there's really nowhere to point it as all discussions have closed and been ground to a halt. [[User:TheHYPO|TheHYPO]] ([[User talk:TheHYPO|talk]]) 19:50, 30 January 2013 (UTC)

But is it really an edit war? Have they been moving the page bach and forth? --[[User:St.nerol|St.nerol]] ([[User talk:St.nerol|talk]]) 00:18, 31 January 2013 (UTC)

I still feel the most retarded of discussions on Wikipedia is for the Hentai article, where a disturbing majority demand pornography. --[[Special:Contributions/59.167.191.93|59.167.191.93]] 08:05, 31 January 2013 (UTC)

Just a minor matter of correctness... but shouldn't this page be entitled "1167: Star Trek Into Darkness", with a capital I, you know, since that's the way the movie studio is writing it, even though it doesn't follow MOS? I think someone needs to fix it RIGHT NOW! --boB
:Hey boB, you should fix your username! :P I'm kidding. I think the wiki just follows what is on the xkcd website, which has the lower case "i".--[[User:Pnariyoshi|Pnariyoshi]] ([[User talk:Pnariyoshi|talk]]) 22:45, 31 January 2013 (UTC)

I wish the Super Bowl Halftime Show could be that talk page being presented in a dramatic on stage performance. wow. Do you think Ian McKellen is available?--[[User:Shine|Shine]] ([[User talk:Shine|talk]]) 19:29, 31 January 2013 (UTC)

It looks like it's been moved to the capital I. I'd say that it's definitely because xkcd mentioned it. [[Special:Contributions/76.122.5.96|76.122.5.96]]

: https://twitter.com/wikisignpost/statuses/297188486421831680 :-) --[[User:Mormegil|Mormegil]] ([[User talk:Mormegil|talk]]) 07:56, 1 February 2013 (UTC)

I wanna be the guy who has to watch the xkcd website for new Wikipedia-related comics and lock the related article as quickly as possible... [[User:Ilinamorato|Ilinamorato]] ([[User talk:Ilinamorato|talk]]) 15:44, 1 February 2013 (UTC)

Perhaps it is worth noting that the argument over whether to include a section about the dance-off and the following xkcd mention is now growing on the talk page and already has a couple thousand words of dance-off. {{unsigned|24.114.22.89}}

:That reminds me of the time that I was reading my Encyclopedia Britannica and happened across the section on the Titmouse and it mentioned the dance-off the editors were having on whether to include a joke about {{w|Tufted_Titmouse|Titmice}} and {{w|tit_(bird)|tits}} being cousins of sorts. Oh Wait.... --[[User:Shine|Shine]] ([[User talk:Shine|talk]]) 23:06, 1 February 2013 (UTC)

Maybe someone who has seen Contact wants to add some comment about the meaning of the quote or why it is relevant/funny? –[[User:St.nerol|St.nerol]] ([[User talk:St.nerol|talk]]) 18:45, 18 February 2013 (UTC)

This may be obvious to others, but I don't know why the ~*~ symbol is used for the alternate capitalization. Can someone explain what the meaning of those characters is? [[User:Djbrasier|Djbrasier]] ([[User talk:Djbrasier|talk]]) 19:06, 22 May 2015 (UTC)
I think it is making fun of old AIM profiles and similar username choices, usually with 'random' capitalization and xX or ~*~* , examples: [1] http://img.ifcdn.com/images/60a97877d77df653f3c29a9f78f342958c00b864d68eda6a6324cafda44ffc69_1.jpg , http://knowyourmeme.com/memes/katy-t3h-pengu1n-of-d00m , https://img.buzzfeed.com/buzzfeed-static/static/2015-07/1/16/enhanced/webdr04/enhanced-20005-1435781306-7.jpg --[[Special:Contributions/108.162.221.91|108.162.221.91]] 19:29, 12 June 2016 (UTC)

I don't know if the title text was changed from what it was originally, but on xkcd.com it says "factions sprang up..." not "crackers..." -[[Special:Contributions/108.162.246.174|108.162.246.174]] 20:18, 27 May 2015 (UTC)

Must be the capital "I". That's final! Everything else is plainly stupid! If you like your franchise, then let the movies have beautiful titles. If you use lower-case "i", it's ugly. Btw I'm not a fan of Star Trek. And I don't want to join the war(s). I'm gone. Bye! {{unsigned ip|162.158.85.117}}

Talk:1167: Star Trek into Darkness

2016-06-12T19:29:07Z

108.162.221.91:

1682: Bun

2016-05-19T10:54:47Z

108.162.221.91: Rabbit means Little King in some slavil languages

{{comic
| number = 1682
| date = May 18, 2016
| title = Bun
| image = bun.png
| titletext = If a wild bun is sighted, a nice gesture of respect is to send a 'BUN ALERT' message to friends and family, with photographs documenting the bun's location and rank. If no photographs are possible, emoji may be substituted.
}}

==Explanation==
In this comic, [[Ponytail]] is teaching a class about an animal referred to as a "bun". The word "bun" is short for {{w|bunny}}, an informal term used for a {{w|rabbit}}. The comic lampoons the many misconceptions that exist about rabbits and {{w|hares}}, two animals that are often mistaken for one another.

Ponytail tells that buns have a {{w|hierarchy}} in which the smaller the bun, the higher its ranking is. This parodies the general tendency of people to consider kitten rabbits cuter than the adults, and therefore superior (According to some studies, cuteness in humans may have evolutionary advantages by encouraging parental care; it is unknown if this is true among rabbits). Rabbits live in large groups with no formal hierarchy, unlike {{w|wolves}} who have very definite leaders and social structure (the whole alpha wolf thing is actually outdated, see https://en.wikipedia.org/wiki/Gray_wolf#cite_note-62 on this), this is in stark contrast to the information presented in the comic.

In the next panel, Ponytail states that "at this time of year, a lucky few may catch a glimpse of a king bun" - referring to rabbit kittens (the smallest and thus, in the comic, the highest-ranking, hence the term "king buns") being born in Spring (when the comic was released). Also interesting to note is that in several Slavic languages (including Russian, Czech and Polish), the word for Rabbit literally means Little King

[[Megan]], who attends this biology class, expected to learn about rabbits and hares which are both {{w|Lagomorpha|lagomorphs}}, a mammalian {{w|Order (biology)|order}} that also includes the {{w|pika}}s. Megan thus clearly has the correct understanding of what a "bun" is. Ponytail then claims that the word ''bun'' is the scientific term, and states that rabbit, hare and lagomorph is the informal way to describe these animals, again being completely wrong as in reality ''bun'' is the most contracted and informal name for a rabbit.

Two students are then legitimately doubting that they're in the correct class and decide to check online (either the crude theories that Ponytail expressed, or their course schedule). A third student however appears to believe the lecturer uncritically, reminding the fellow students that they're looking upon the image of a king (i.e. a cute bunny).

The title text is presumably referring to photographing a rabbit and, for example, posting it on social media - something which would typically be done today if someone sees a rabbit in the wild. If the poster had failed to photograph the rabbit before it ran away, they may typically post a message saying something like "I saw a really cute bunny today!" with an {{w|emoji}} depiction of a rabbit (probably 🐇 or [http://www.amazon.com/WEP-Emoticon-Cushion-Stuffed-Colorful/dp/B01EMBET4A 🐰]). This is especially common in the area where the author lives, as the urban rabbit population in the Cambridge/Somerville area has exploded, putting a large human population with relatively little previous experience with rabbit-sightings suddenly in the position of encountering them very frequently.

A teacher teaching complete nonsense is depicted in [[1519: Venus]], but there it is clearly on purpose, which is not so clear here. There are also some similarities with [[1644: Stargazing]], but there the facts are true.

==Transcript==
:[Ponytail is a teacher and she holds a pointer to a picture of a rabbit on a board behind her.]
:Ponytail: Good morning class! Today, we will be learning about the bun.

:[Two rabbits are shown, one slightly smaller, and a greater than symbol is pointed at the smaller one. Ponytail is talking off panel to the left.]
:Ponytail (off panel): Buns have a hierarchy.
:Ponytail (off panel): A bun's rank is determined by its size. Smaller buns are higher-ranking.

:[Two normal sized rabbits are sitting left and right of a very small rabbit. The smaller rabbit appears to give off a radiant light indicated with gray and white alternating rays going through the image. It is indicated that is shines on the larger rabbits as they are gray on the side turned away from the smaller rabbit and white on the front turned towards it. Ponytail narrates above the frame of this half sized panel:]
:Ponytail (narrating): Most buns you see are relatively low-ranking.
:Ponytail (narrating): But this time of year, a lucky few may catch a glimpse of a ''king bun''.

:[A student represented by Megan is sitting at a desk with a few books on it, pencil in hand.]
:Megan: Ok, hang on.
:Megan: We're talking about rabbits and hares, right? Lagomorphs?

:[Ponytail is holding her finger up on her left hand, and is holding her pointer at her side with the other. Students reply to her off panel to the right.]
:Ponytail: Informally, yes. But in this course, we use the ''scientific'' term, "bun".
:Student #1 (off-panel): Are we sure this is the right room for ''introductory mammalogy?''
:Student #2 (off-panel) : I'll check online.
:Student #3 (off-panel): ''Shh!'' Show respect! We look upon the image of a king!

==Trivia==
*In the [http://www.explainxkcd.com/wiki/images/archive/2/2c/20160518175345!bun.png original version] the word ''hierarchy'' in the 2nd panel was misspelled as ''h'''ei'''rarchy''. This led to speculation regarding the near-homonyms "heir" and "hare", but the spelling was later corrected.
*In [[1663: Garden]], the rabbit image had the filename "[http://xkcd.com/1663/art/2x-important-bun.png important-bun.png]":
**[[File:Garden Important bun.png]]

{{comic discussion}}

[[Category:Comics featuring Ponytail]]
[[Category:Comics featuring Megan]]
[[Category:Animals]]

Talk:1557: Ozymandias

2015-09-01T20:40:08Z

108.162.221.91: another recursive "story" example ...

Look upon this comment and despair! {{unsigned ip|173.245.50.164}}
: The fact that the true author of this comment may never be known is reason enough to despair.[[Special:Contributions/173.245.55.66|173.245.55.66]] 14:35, 29 July 2015 (UTC)
: An unrelated but interesting piece of trivia about Ozymandias: "Ozymandias" is the Greek name of the pharaoh Ramesses II, one of the most famous of the Egyptian pharaohs, who built many monuments that still stand today. So the poem, which has a ruler whose monument has crumbled and who is implied to be nearly forgotten, is in fact completely inaccurate! [[User:JoeNotCharles|JoeNotCharles]] ([[User talk:JoeNotCharles|talk]]) 15:23, 29 July 2015 (UTC)
:: Perhaps the Ozymandias King of Kings from the poem is not the same one as Ozymandias the pharaoh? So he's doubly forgotten, because he has a more famous [http://en.wiktionary.org/wiki/namefellow namefellow]! [[User:Leoboiko|Leoboiko]] ([[User talk:Leoboiko|talk]])

So... [http://dwarffortresswiki.org/index.php/Planepacked Planepacked]? [[Special:Contributions/173.245.50.145|173.245.50.145]] 05:44, 29 July 2015 (UTC)

The page seems to give a description, but not an explanation of the joke. I still don't get it! Why has Ozymandias been singled out for this treatment? Is there some way in which recursion is particularly appropriate or inappropriate in this case, or has it just been selected arbitrarily? Is the whole joke that recursion is inherently funny? Normally when recursion is used in XKCD it's making a larger point, or cleverly riffing on something in particular. This isn't just Describe XKCD, so I'd love to see an explanation of this comic. [[Special:Contributions/141.101.99.47|141.101.99.47]] 09:35, 29 July 2015 (UTC)

:The poem Ozymandias, like the statue of the king,can be thought of as a pinnacle of achievement for its civilizarion- in this case, English civilization. So it is entirely possible that one day, after the fall of this civilization, the poem will fill the same role for it that the statue filled for Ozymandias' (fictional) civilization. [[User:Bbruzzo|Bbruzzo]] ([[User talk:Bbruzzo|talk]]) 15:33, 29 July 2015 (UTC)

:May it be that Ozymandias is chosen because of Smith’s poem, where at last London has vanished, suggesting that Shelley’s poem is the last remains of British civilization? --[[Special:Contributions/162.158.91.193|162.158.91.193]] 10:04, 29 July 2015 (UTC)

:I think Ozymandias was chosen because its opening is particularly famous. Even people who don't know much about poetry are often passingly familiar with it, and there's something funny about playing with well-known classics. And yes, I do believe the joke is that infinite recursion is inherently funny. There's a long tradition of these recursion-jokes among computer scientists and math people (like the "GNU" acronym, or recursive index references), with precedents in xkcd itself. [[User:Leoboiko|Leoboiko]] ([[User talk:Leoboiko|talk]])

In Germany, we have a childrens’ song „Ein Mops kam in die Küche“, which translates as follows (there are slightly different versions, though):

A pug came into the kitchen / and stole an egg from the chef. / Then the chef took his knife / and mashed the pug. // Then many pugs came / to his grave / and set a memorial for him, / where these words were written: // “A pug came into the kitchen …”

Maybe something similar exists in English? --[[Special:Contributions/162.158.91.193|162.158.91.193]] 10:04, 29 July 2015 (UTC)

:We have:

: This is the song that doesn't end, / Yes, it goes on and on, my friend, / Some people started singing it not knowing what it was, / And they'll continue singing it / Forever, just because [repeat] :''— [[User:Tbc|tbc]] ([[User talk:Tbc|talk]]) 12:34, 29 July 2015 (UTC)''

:There's also:
::I know a song that gets on everybody's nerves, everybody's nerves, everybody's nerves,
::I know a song that gets on everybody's nerves and this is how it goes...[repeat] {{unsigned ip|197.234.243.249}}

:: In Dutch: "Het was nacht, stikdonkere nacht. Veertig rovers zaten rond een vuur. De roverhoofdman stond op een zei: "Het was nacht, stikdonkere nacht... " "
:: Which translates to something along the lines of: "It was night, a pitchblack night. 40 robbers sat round a fire, their leader stood up and said: "It was night, a pitchblack night..." "
:: Sometimes the fire is replaced by the shadow of a dandelion. "..Forty robbers sat in the shadow of a Dandelion, their Chief stood up and said: "It was a dark night, forty robbers sat in the shadow of a dandelion", etc. -- [[Special:Contributions/141.101.104.67|141.101.104.67]] 13:01, 29 July 2015 (UTC)

::: The version I learned is: It was a dark and stormy night / and the good ship Marigold sailed the stormy seas. / The captain staggered down the steps / and said, "Mate, tell us a story!" / and the mate began, / "It was a dark and story night... --[[User:Mflansburg|Mflansburg]] ([[User talk:Mflansburg|talk]]) 15:44, 29 July 2015 (UTC)

:I've heard a very long infinitely recursive song in English, which is a variant of "The Bear Went Over the Mountain". The standard lyrics are:

:: The bear went over the mountain, the bear went over the mountain, the bear went over the mountain to see what he could see / And all that he could see, and all that he could see / Was the other side of the mountain, the other side of the mountain, the other side of the mountain, and that's what he could see.

: Well, the infinite variant goes:

:: The bear went over the mountain the bear went over the mountain, the bear went over the mountain to see what he could see / And all that he could see, and all that he could see / Was a valley in the mountain, a valley in the mountain, a valley in the mountain, and that's what he could see
:: The bear went over the mountain the bear went over the mountain, the bear went over the mountain to see what he could see / And all that he could see, and all that he could see / Was a lake in the valley, a lake in the valley, a lake in the valley, and that's what he could see
:: ... a sailboat on the lake ...
:: ... a man in the sailbot ...
:: ... pants on the man ...
:: ... a pocket in the pants ...
:: ... a nickel in the pocket ...
:: ... a beaver on the nickel ... (Note: I just realized this line only works in Canada, where the five cent coin has a picture of a beaver on it.)
:: ... a hair on the beaver ...
:: ... a flea on the hair ...
:: ... cells in the flea ...
:: ... a prisoner in the cells ...
:: ... pants on the prisoner ...
:: ... a pocket in the pants ...
:: etc.

: I prefer a slightly shorter version which goes from "a pocket in the pants" to "a dime in the pocket", then "a sailboat on the dime" (which again only works in Canada), and back to "a man in the sailboat". [[User:JoeNotCharles|JoeNotCharles]] ([[User talk:JoeNotCharles|talk]]) 15:14, 29 July 2015 (UTC)

:: I thought everyone (American) knew the song (needs music notation) "There's a Hole in the Bottom of the Sea?" One version finally ends with "There's a germ on the flea on the hair on the speck on the spot on the wart on the frog on the bump on the log in the hole in the bottom of the sea." But kids make up all sorts of variations. Or they used to. [[User:Taibhse|Taibhse]] ([[User talk:Taibhse|talk]]) 10:00, 30 July 2015 (UTC)

: There's also [[Special:Contributions/108.162.215.30|108.162.215.30]] 20:28, 29 July 2015 (UTC)

:: Yon Yonson - https://en.wikipedia.org/wiki/Yon_Yonson
:: Mighty mighty - https://answers.yahoo.com/question/index?qid=20070602235838AA6qSzz {{unsigned ip|108.162.215.30}}

::
Note that the recursion doesn't necessary be infinite. The list of travelers who met each other can have fixed length, for example 10. Imagining that the list is infinite is the joke. -- [[User:Hkmaly|Hkmaly]] ([[User talk:Hkmaly|talk]]) 10:06, 29 July 2015 (UTC)
: I think that might be the point actually, the idea is that with each time someone tells the poem to someone else, it grows by one, for each traveler from an antique land has been told by by a different traveler from an antique land[[Special:Contributions/108.162.219.39|108.162.219.39]] 01:08, 30 July 2015 (UTC)

Should we mention {{w|quines}}, which occur when lists like this end after two iterations, as "Yo, I'm MC Quine and I'm here to say/'Yo, I'm MC Quine and I'm here to say'!" {{unsigned|FourViolas}}

: That's not exactly a quine - a quine is a set of instructions which, when followed, recreates the instructions. If you take MC Quine's quote and write it out, you get just, "Yo, I'm MC Quine and I'm here to say", which doesn't contain the second repetition. To be a quine, you need to find some way that taking just the quoted part will automatically expand to the full statement plus the quote.

: A closer example of a quine: "Q: Pete and Re-Pete were sitting on a bridge. Pete fell off. Who was left? A: Repeat." If you take the answer "repeat" as an instruction, you would repeat the joke, recreating it completely. [[User:JoeNotCharles|JoeNotCharles]] ([[User talk:JoeNotCharles|talk]]) 15:19, 29 July 2015 (UTC)

This reminds me of Theodor Storm's "Schimmelreiter" ([https://en.wikipedia.org/wiki/The_Rider_on_the_White_Horse "The Rider on the White Horse"]) which descends through three nested levels of narrators before it comes to the real story. --[[User:Ulm|ulm]] ([[User talk:Ulm|talk]]) 13:56, 29 July 2015 (UTC)

One connection between recursion and Ozymandias is the phrase "Quis custodiet ipsos custodes?" aka "Who watches the watchmen?" and the character in ''The Watchmen'' named Ozymandias. [[Special:Contributions/108.162.221.51|108.162.221.51]] 14:42, 29 July 2015 (UTC)

Nested Shelleys? Maybe associaing Shelley with shells could be part of the joke? [[Special:Contributions/108.162.216.115|108.162.216.115]] 16:02, 29 July 2015 (UTC)

I keep trying to see 10, but I keep counting 11 syllables in each line with the exception of the last one. [[Special:Contributions/108.162.210.210|108.162.210.210]] 16:48, 29 July 2015 (UTC)
:You have to read traveler as trav'ler. [[User:Uptonc|Uptonc]] ([[User talk:Uptonc|talk]]) 16:57, 29 July 2015 (UTC)
:: Well, that's just wrong... [[Special:Contributions/108.162.216.81|108.162.216.81]] 17:14, 29 July 2015 (UTC)
::: Um... No it's not. There are [http://dictionary.reference.com/browse/traveler?s=t two ways to pronounce it] (trav-uh-ler and trav-ler), kind of like toe-may-toe, toe-mah-toe. [[Special:Contributions/108.162.219.196|108.162.219.196]] 18:11, 29 July 2015 (UTC)
::::And you can pronounce "dog" as "cat". Language is funny like that. [[Special:Contributions/108.162.210.187|108.162.210.187]] 15:24, 30 July 2015 (UTC)
:::::Ok it's going to bug me otherwise, but, how? I mean, I figure it's probably one of those ghoti-fish things, but still. -Pennpenn [[Special:Contributions/108.162.250.162|108.162.250.162]] 23:07, 30 July 2015 (UTC)
::::::There's certain British accents (and probably elsewhere, but let's start here as an example) where a person saying a word such as "film" can only seem to say it as if it is "fillum". A kind-of-1.5-syllable-at-most word for most people (close to the word "firm", but the tongue used differently), but distinctly two for others (who ''can'' say their "L"s, but 'disengage', rather than let the word flow). (Actually, there's also accents that would make "firm" sound like "firrum", because of their 'harder' "R"s, but that's superfluous to this explanation.) So if you have a problem getting "Traveller" down to the two-syllable "Travler", you may have a similar sort of acquired pronunciation. See also "vehicle" ("vee-hic-al", "vere-cal"), which I know is predominant in certain of the US states. [[Special:Contributions/141.101.98.188|141.101.98.188]] 06:14, 1 August 2015 (UTC)

I think everyone's looking far too hard for something obscure and clever. :) Ozymandias is in the poem described as the "king of kings", which makes him recursively kingly. Hence, the recursion joke. (I went ahead added that to the explanation, it's my first contribution here so hopefully I didn't bypass any explainxkcd wiki house rules) [[User:Orinthe|Orinthe]] ([[User talk:Orinthe|talk]]) 06:24, 30 July 2015 (UTC)

When my brother and I were very young, and stayed overnight at my grandparents, my grandfather would often tell us the following bedtime story, with great seriousness, and many dramatic pauses:

"We were all seated around the camp fire, when the Captain said, to his faithful servant: 'Antonio, Antonio, tell unto us a story.' And Antonio began: "We were all seated around the camp fire, when the Captain said, to his faithful servant: 'Antonio, Antonio, tell unto us a story.' And Antonio began: "We were all seated around the camp fire, when the Captain said, to his faithful servant: 'Antonio, Antonio, tell unto us a story...

By that time we were often asleep. {{unsigned|Matthew-e-hackman}}

There is a old Chinese story with recursion like this that goes like:
<pre>从前有座山 Once upon a time, there was a mountain.
山上有座庙 Upon that mountain, there was a temple.
庙里有个老和尚和小和尚 In the temple was an old monk and a young monk
老和尚讲了一个故事说 The old monk told a story, saying
从前有座山 Once upon a time, there was a mountain.
山上有座庙 Upon that mountain, there was a temple.
庙里有个老和尚和小和尚 In the temple was an old monk and a young monk
老和尚讲了一个故事说 The old monk told a story, saying
....</pre>

[[Special:Contributions/162.158.255.59|162.158.255.59]] 07:00, 31 July 2015 (UTC)

Not that you need another example of recursion, but this brings back very distinct personal memories. Whilst my father actually used to read books to me, at bedtimes, on occasion (for whatever unfathomable reason, lost on the mists of time) he would sometimes tell me a freestyle story that started "Once upon a time, there was a little boy who said to his daddy 'Daddy, tell me a story!', and his daddy said, alright then. 'Once upon a time, there was a little boy who said to his daddy "Daddy, tell me a story!", and his daddy said, alright then. "Once upon a time, there was a little boy who said to his daddy 'Daddy, tell me a story!', and his daddy said, alright then. ..."'" But by that point (if not earlier, depending on how grumpy I was) I'd usually interupt him, so I suppose I never actually ''did'' find out what where this was might have been going. (And he forever asserted it ''was'' going somewhere.) [[Special:Contributions/141.101.98.188|141.101.98.188]] 06:14, 1 August 2015 (UTC)

This comic's TOO META. [[Special:Contributions/108.162.210.135|108.162.210.135]] 21:23, 2 August 2015 (UTC)

In response to "You're/That's/This is crazy: "Crazy!? I was crazy once. They took me to a room and locked me up. There were rats in that room that gnawed at the walls. The rats drove me crazy! Crazy!? I was crazy once ... " and so on...[[Special:Contributions/108.162.221.91|108.162.221.91]] 20:40, 1 September 2015 (UTC) Kickasstimus

55: Useless

2014-05-09T14:12:44Z

108.162.221.91: /* Basic explanations of the functions */

{{comic
| number = 55
| date = January 27, 2006
| title = Useless
| image = useless.jpg
| titletext = Even the identity matrix doesn't work normally
}}

==Explanation==
[[Randall]] is attempting to apply mathematical systems to the concept of love to no avail. Specifically, he is attempting his "normal approach" which is a term used in mathematics for the method one typically uses to solve a certain type of problem. However, as love is not a mathematical value, his normal approach is useless. Simply put: He's saying that math has no way of describing love (or more precisely, ''he'' has no way of describing love, using only the tools of mathematics.)

From the top, going right, he tries the {{w|square root}} of love; the {{w|cosine}} of love; the {{w|derivative}} of love with respect to x; he multiplies love by a 2x2 {{w|identity matrix}}, and finally he defines a {{w|Function (mathematics)|function}} of love as a {{w|Fourier transform}}. These may all be "normal approaches" to solving certain math problems.

The long and the short of the comic is that this might be the thinking of someone who uses math to solve all their problems upon their discovering love, which can't be solved with math.

===Basic explanations of the functions===
:''Note: The Wikipedia links will provide far more detailed explanations of the mathematics.''
*The square root of x is the number which, when multiplied by itself, equals x.
*Cosine is a {{w|trigonometric function}} which, when given the measure of an angle in a {{w|right triangle}} as an input, outputs the ratio of the lengths of two sides of that triangle (for cosine it is the non-{{w|hypotenuse}} side adjacent to the angle and the hypotenuse).
*A derivative of a function is the rate of change of that function at a given value of x. It is a primary focus of {{w|calculus}}. A basic example is where "velocity" is the rate of change of displacement at a given time, the derivative of velocity is "acceleration" which is the rate of change of velocity at a given time.
*Identity matrices are matrices which consist of only zeros and ones, with zeros everywhere except along the {{w|main diagonal}}. Multiplying a matrix by the equal-sized identity matrix will result in the same output in the same way that multiplying a non-matrix by 1 does not change the original term. The title text suggests that multiplying love by the identity matrix does not return the same "love" value.
*A {{w|Fourier transform}} converts a function from one (sophisticated) function into an endless continuous series of (more simple) functions, where each next part is bringing the equation closer to the real result. This means that you can stop your calculations after a few iterations and you are very close to the real result, and it also can be used to deconstruct signals.

==Transcript==
:[Different mathematic equations, all with heart on left side, and all equal question mark. Equations are as follows:
:Square root of heart equals question mark
:Cosine of heart equals question mark
:Derivative of heart with respect to x equals question mark
:Identity matrix of heart equals question mark
:Fourier transform of heart equals question mark.]
:My normal approach is useless here

==Trivia==
*This is the fifty-second and last comic originally posted to LiveJournal. The previous comic was [[53: Hobby]].
*The version used on the [http://store.xkcd.com/products/useless t-shirt] and in ''[http://store.xkcd.com/products/xkcd-volume-0 xkcd: volume 0]'' is slightly different. The derivative is with respect to time (''t'') instead of ''x'', and the function at the bottom is a different one.
*This comic was adapted to a wedding cake featured on [http://www.cakewrecks.com/home/2011/6/26/sunday-sweets-geek-wedding-cakes.html an installment of "Sunday Sweets"], a regular feature on popular blog [http://cakewrecks.com Cake Wrecks].

{{comic discussion}}
[[Category:Comics posted on livejournal]]
[[Category:Romance]]
[[Category:Math]]

572: Together

2014-04-27T21:44:48Z

108.162.221.91: /* Explanation */

{{comic
| number =572
| date =April 22, 2009
| title =Together
| image =together.png
| titletext =This scavenger hunt is getting boring. Let's go work on the treehouse!
}}

==Explanation==
[[Cueball]] and [[Megan]] run away from Cueball's two friends when they are very young. They fall in love, get married, and grow old together. At the end he leaves his wife - without saying goodbye or explaining why he leaves. He returns to the same place where he left his two friends that has been waiting on him with the list they also had in the first picture. And we finally learn, that being happy was just another thing crossed off Cueball's list of what is presumably the longest-duration scavenger hunt of all-time, considering Cueball grew quite old before ever completing that step on the list. And when he did - he just got up and left his lifelong wife... Because now he was ready for the next item on the list.

The title of the comic is probably a reference to the saying that you find happiness ''together'' with your loved ones. So after finding a penny and a snake skin he had to get married and old to be able to find happiness. Next he needs to find a Four-leaf clover and a shark tooth to continue the hunt.

The treehouse reference in the title text is another example of a common childhood activity. Naturally, the intended mental image is a bunch of old men building a treehouse and living and playing in it like six year olds. And also typical for children to tire of a game before it is finished. Except here he already spend a lifetime on just one point!

==Transcript==
:Cueball and Megan are running in a field, holding hands. Another male and female stand in the background, next to a table.]
:[Cueball and Megan are in a boat on a lake, very romantic. Cueball is speaking to Megan, illustrated with a heart.]
:[Cueball and Megan sit together on a bench on a beach, watching the sunset.]
:[Cueball and Megan stand at an altar. They have married.]
:[Cueball and Megan, having grown old together, sit together on their doorstep, holding hands.]
:[Cueball begins walking away with his cane.]
:Megan: Dear? Where are you--Come back!
:Cueball approaches the other couple from the first panel, who are now just as old.]
:[Cueball picks up a piece of paper from the table in the first panel and begins to write.]
:Cueball: Okay,
:[The paper is shown: a scavenger hunt list. "Happiness"; has just been checked off.]
:Cueball: What's next?
:[Full list:
:SCAVENGER HUNT:
:[X] Indian-head penny
:[X] Snake skin
:[X] Happiness
:[ ] Four-leaf clover
:[ ] Shark tooth
:[The next item is blocked by the speech balloon.] What's next?

==Trivia==
*This is also referenced in [[212: Brain]] as something Randall really wants to do.

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

Talk:1335: Now

2014-04-07T03:29:23Z

108.162.221.91:

<pre>| custom = [http://c.xkcd.com/redirect/comic/now]</pre>
This doesn't work. Maybe if we added *.xkcd.com/* to the (external) image whitelist or something? [[Special:Contributions/108.162.231.121|108.162.231.121]] 07:27, 26 February 2014 (UTC)
:A fine suggestion. I'm probably going to shoot for full archival like we did with [[time]], but this is an ample good solution in the meantime. '''[[User:Davidy22|{{Color|#707|David}}y²²]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 07:30, 26 February 2014 (UTC)
:Hold on, having wee issues, will resolve soon. '''[[User:Davidy22|{{Color|#707|David}}y²²]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 07:37, 26 February 2014 (UTC)

Here is a scaled animation of every image. The full size version was too big for me to upload.
[[File:now-100ms_small6-1.gif|none]]
[[User:Ti84p|Ti84p]] ([[User talk:Ti84p|talk]]) 07:47, 26 February 2014 (UTC)

For Australia and New Zealand, at least, the clock shows local time with summer time factored in. I bet that it undergoes some changes in March and April as various jurisdictions go on or off daylight saving. [[Special:Contributions/108.162.249.224|108.162.249.224]] 09:20, 26 February 2014 (UTC)

: Good point! I added this to the explanation. —[[User:TobyBartels|TobyBartels]] ([[User talk:TobyBartels|talk]]) 13:15, 26 February 2014 (UTC)

:: There's also British Summer Time and all the ''other'' national seasonal adjustments(1)... could you perhaps de-specify the "move the list of North American cities and regions for Daylight-Saving Time (which is the same thing as Summer Time)" statement to remove the inadvertent US-centrism? Maybe "...of northern-latitudes cities for Daylight-Saving Time or equivalent Summer Time designation"..? (Definitely could be better phrased than I just put, though.)
:: (1) Note, they don't even all switch at the same time, necessarily. If Randall is going to change the basic map template (pre-rotation) for any Summer/non-Summer transition, he's probably going to have to do it multiple times each spring/autumn, as various regions jiggle about. [[Special:Contributions/141.101.99.41|141.101.99.41]] 13:52, 26 February 2014 (UTC)

::: Exactly, they don't all switch at the same time. North America isn't mentioned to be US-centric, it's mentioned because the change happens there first. Sure, we could bring up BST and all the rest, but there's no need to make the discussion longer than necessary. (The original wording also was not US-centric, privileging the non-US term "Summer Time" that's used where it's currently being observed, but somebody changed that.) —[[User:TobyBartels|TobyBartels]] ([[User talk:TobyBartels|talk]]) 18:14, 26 February 2014 (UTC)
::::I made that change just to use the same title as the Wikipedia page to which we are linking. I don't feel strongly about it. --[[User:BlueMoonlet|BlueMoonlet]] ([[User talk:BlueMoonlet|talk]]) 18:46, 26 February 2014 (UTC)

As for the map itself, I think the title text should provide the exact time for the location under the cursor, by doing calculations for the mouseover event and updating the t.t. accordingly. I imagine it is doable for Randall. For accuracy's sake, the Antarctic region could be excluded. [[Special:Contributions/141.101.89.225|141.101.89.225]] 12:19, 26 February 2014 (UTC)
: Or maybe someone'll fancy doing it as a userscript. [[Special:Contributions/141.101.89.225|141.101.89.225]] 12:23, 26 February 2014 (UTC)

I made a version that the user can rotate themselves. It only loads a single image. http://c0la.s3.amazonaws.com/xkcd1335.html {{unsigned ip|173.245.53.182}}

The gif image is very good to understand this comic. However it would be very nice if it rotated a little slower. Instead of one turn every ten seconds it could be one every minute. [[Special:Contributions/173.245.50.84|173.245.50.84]] 14:37, 26 February 2014 (UTC)

: When I look a little off-centre, it always seems that South America is about to catch up with Antarctica, but it never does! —[[User:TobyBartels|TobyBartels]] ([[User talk:TobyBartels|talk]]) 18:14, 26 February 2014 (UTC)

He used an Azimuthal equidistant projection?!?!? ;_; [[User:Swhouseworth|Swhouseworth]] ([[User talk:Swhouseworth|talk]]) 16:20, 26 February 2014 (UTC)

: Yeah, should have been equal area! —[[User:TobyBartels|TobyBartels]] ([[User talk:TobyBartels|talk]]) 18:14, 26 February 2014 (UTC)

:: On the Transcript for this comic the last line erroneously describes the innermost circle as "the Earth as seen from the south pole", when as Swhouseworth correctly points out, this is an Azimuthal equidistant projection centered on the south pole. —[[User:Andrewpost|Andrewpost]] ([[User talk:Andrewpost|talk]]) 14:43, 27 February 2014 (UTC)

Question: If there are 24 Hours in a day, why in the description does it go from hour 0 to hour 21? That's only 22 hours. Where are the other 2 hours? Even if it isn't listed on the comic (I think it's the time zones in the Atlantic between Eastern Brazil and the UK - basically UTC-1hr and UTC-2hr), shouldn't there be spaces in the charts showing those hours? I don't think any of the islands in that region use those time zones (opting instead to use GMT - like Iceland for example), but I think those hours should still be included since they ''are'' on the static part of the map. Also, it makes sense to me that the center of the words ''NOON'' and ''MIDNIGHT'' are edges of segments themselves, making 24 segments in total. Randall just couldn't draw those discrete segments and also easily have the words written for our convenience. --[[User:Dangerkeith3000|Dangerkeith3000]] ([[User talk:Dangerkeith3000|talk]]) 16:46, 26 February 2014 (UTC)

: Every time zone is used somewhere in international waters (well, every one that's a whole number of hours off of Universal Time), so they certainly should all be included. —[[User:TobyBartels|TobyBartels]] ([[User talk:TobyBartels|talk]]) 18:14, 26 February 2014 (UTC)
: Added South Georgia as UTC-2 and Cape Verde as UTC-1. According to Wikipedia, coastal Brazil and Greenland are both UTC-2 during the summer, but Brazil just ended summer time last Sunday (Feb. 23), and Greenland won't start until late March. There are approximately no permanently inhabited places that use UTC-2 all year, so I just went with South Georgia because it's historically significant. [[User:Fryhole|Fryhole]] ([[User talk:Fryhole|talk]]) 20:20, 26 February 2014 (UTC)

Randall's continent naming scheme is interesting. The most commonly taught model in the U.S. has seven continents, but the purple continent is Australia rather than Oceania. The name Oceania is common in Spanish-speaking countries, but those places generally have a six-continent model with the Americas merged. Is Randall's model standard anywhere? [[User:Fryhole|Fryhole]] ([[User talk:Fryhole|talk]]) 20:00, 26 February 2014 (UTC)

: FIBA and, before 2006, FIFA. (In 2006 FIFA moved Australia from Oceania to Asia). As a further parallel neither the sporting bodies nor the comic actually mention Antarctica. Note that the comic does not say these are continents. Oceania has some distinct characteristics, so it often shows up as a "region of the world".
[[Special:Contributions/108.162.218.59|108.162.218.59]] 19:08, 27 February 2014 (UTC)
distinoften shows up as a "region of the world". It has some distinct characteristics, which is why FIFA, FIBA and others treat it as a region.
[[Special:Contributions/108.162.218.59|108.162.218.59]] 19:08, 27 February 2014 (UTC)

Kamchatka is probably a reference to 850: https://xkcd.com/850/ [[Special:Contributions/108.162.216.48|108.162.216.48]] 20:22, 26 February 2014 (UTC)

Hey, I'd just like to note that GIMP "Optimize for GIF" reduced the GIF size to 7.1MiB from current 9.3MiB. If I reduced the colours to 32, which still looked "good enough" in my opinion, the GIF was only 3.5MiB.
http://m8y.org/tmp/temp.gif (optimize)
http://m8y.org/tmp/temp2.gif (optimize + colour reduction)

It might be worth replacing to improve load times.
You might want to make your own since I didn't check frame times or anything, I just ran "index" and "optimize" and then exported{{unsigned ip|108.162.219.77}}
:You are right, but that picture should be less then 1MB. I will do some tests, and if it does work I will talk about this. --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 23:51, 26 February 2014 (UTC)
::m'k - well. Using 20 colours and scaling it down 50% resulted in 1.1MiB... http://m8y.org/tmp/temp3.gif
:::I'm now at the time frame at "Rude to call", but nevertheless the PNG files have to be optimized to a GIF, after that an animated GIF should be much smaller. --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 01:03, 27 February 2014 (UTC)
::::I'm guessing an indexed APNG could be smaller (due to more efficient compression) than a GIF, but unfortunately I don't thing apngasm is as efficient as GIMP's optimize for gif feature.

Does anybody know what clock Randall is using? [[Special:Contributions/199.27.128.75|199.27.128.75]]EvanJM42

Randall no doubt knows about the Time Zone Database (http://en.wikipedia.org/wiki/Tz_database) so he may well have coded this page to incorporate seasonal time changes from that database. We'll have to watch what happens.
[[Special:Contributions/108.162.219.15|108.162.219.15]] 12:59, 27 February 2014 (UTC)

Any idea of a way of using this image as a wallpaper for OSX in a way that updates every 30 minutes? Yes, n00b question, but I cannot think of an easily implemented solution. {{unsigned ip|108.162.218.77}}
::Hey. I don't know too much about how OSX does wallpapers, but under Linux, the desktop wallpaper will automatically update if the image is modified. This means you could make a simple shell script that copies (or possibly updates a symlink) to wallpaper.png based upon the current time. The file for the copy or symlink could be referenced as... H=$(date -u +%H); M=$(date -u +%M); FILE="${H}h${M}m.png" I use a similar approach for automatically rotating the image in http://m8y.org/images/sandy_1280_1024_stripped.svg in a cronjob using sed. The sed modification of the svg automatically updates the background. With any luck, you can do the same thing in OSX once you've pointed your wallpaper at a location. {{unsigned ip|173.245.54.56}}

Hello, to the guy asking for a OSX wallpaper, I didn't found a way to do it but I got something pretty close to that. You don't need any scripting skills or anything fancy, just download Geektool(http://projects.tynsoe.org/en/geektool/) from the internet and add an Image Geeklet. In the image URL use the one on the top of this comment section [http://c.xkcd.com/redirect/comic/now] and in the refresh interval select your desired time (I used 900 s roughly 15 minutes, 1800 should work for every 30 minutes). Now, there is a problem but it's beyond my control. The image is not synced with the current time in my country. Just yesterday we changed our clocks because of time savings but apparently the page has not bring forward its clock yet. I don't know who did the awesome job of setting up a page for us to access it but I hope he/she can update it accordingly so we can enjoy an awesome page or if someone else in the community could help.

;Implementations
Hi, I'm new and a tad confused by how this discussion page editing works, but: I made a time zone converter based on this XKCD comic, over here: http://www.xkcdnow.com - I think it could be fitting to add a link to it somewhere to this article, but I don't wanna come across as spammy, and couldn't find any other explainxkcd articles with an external links section (wikipedia style)... Any thoughts? - wauter
: This is a great site! Maybe we could insert an "Implementations" category into the article. If we do so, I could provide another cool one: https://play.google.com/store/apps/details?id=net.phillab.xkcd_now which is a widget for Android - including tribute to explainxkcd -- [[Special:Contributions/173.245.53.146|173.245.53.146]] 16:20, 5 March 2014 (UTC)
:That sounds good to me. The latest release for my version can be found at https://github.com/BruceJohnJennerLawso/xkcd-Now/releases/tag/1.02 on my Github page. By the way, I like your timezones idea, would you mind if I tried to implement that in mine at some point? [[User:BruceJohnJennerLawso|BruceJohnJennerLawso]] ([[User talk:BruceJohnJennerLawso|talk]]) 15:29, 6 March 2014 (UTC)
: I would also like the implementation section. If you use a Windows PC, you can use the script found at http://github.com/leipert/xkcd-now-clock to automatically set your Wallpaper to the current status of xkcd now. It also gives you the possibility to add some an digital clock, an analog clock or fix the image to your time zone. [http://github.com/leipert leipert] 18:02, 6 March 2014 (UTC){{unsigned ip|108.162.254.68}}
:: Spruced up the Implementations section a bit. A quick tip: if you want to make your link work by clicking on the blue text, add a space after the link in the square brackets, & type in the text, ie [link.com This takes you to link.com!!!] {{unsigned|BruceJohnJennerLawso}}

As the US has now hit Daylight Savings, I think we can assume the comic won't be updating for it. [[Special:Contributions/173.245.50.90|173.245.50.90]] 02:54, 10 March 2014 (UTC)

;WEB links
*Who the hell does register an entire domain [http://xkcdnow.com/] for only this comic?
*The JavaScript at the other link doesn't work well for me — but who needs this?
My 0.2 cents. --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 20:57, 10 March 2014 (UTC)

1193: Externalities

2014-03-02T16:05:53Z

108.162.221.91: /* Final Transcript */ Updated the current total donation and what the dog is doing.

{{comic
| number = 1193
| date = April 1, 2013
| title = Externalities
| image = externalities.png
| titletext = Mouse over words and things to see where they come from.
}}
==Explanation==
{{incomplete|BAIDU has to be explained. Also, perhaps an explanation of some of the name references in panel 5}}
This comic isn't a static image - even the title text changes depending on which part of the image you're hovering over. It presented a competition for students to see who could come closest to break a {{w|Skein (hash function)|Skein hash}} but also an aid appeal for the Wikimedia Foundation.

__TOC__

The blank regions in the above image are dynamically generated from various sources.
*The university that is being recruited changes depending on which university is winning the hash finding competition in the fifth panel.
*The company doing the recruiting is randomly selected from a pool of companies. It was formerly the first NASDAQ-100 company mentioned on a varying Wikipedia page.
*The text in the second panel may vary: See [[1193: Externalities#Second Panel|this section]].
*The text in the third panel may vary: See [[1193: Externalities#Third Panel|this section]].
*The text in the fourth panel may vary: See [[1193: Externalities#Fourth Panel|this section]].
*The text in the fifth panel [[1193: Externalities#Fifth Panel|changes]], depending on which university is currently in third place in a hash finding competition. Clicking on the panel takes you to [http://almamater.xkcd.com/ a webpage] where people can enter their school's domain name and hash data, and ranks schools on how close their students can come to matching a Skein 1024 1024 hash value.
*The text in the top half of the sixth panel may vary. See [[1193: Externalities#Sixth Panel|this section]]. The second half of the panel is always the same.
*The last panel varies with the amount donated to the Wikimedia Foundation via [https://donate.wikimedia.org/?utm_medium=socialmedia&utm_campaign=xkcd_april1 this link]. For past images, see [[1193: Externalities#Seventh Panel|this section]].

===Hashing Competition===
For the two days until comic 1194 appeared, a competition was underway to see who could come closest to breaking a {{w|Skein (hash function)|Skein hash}}. The first text line of the first panel contains a link to http://almamater.xkcd.com. This page contained the text:

:Currently looking for Skein 1024 1024 input matching
<pre>5b4da95f5fa08280fc9879df44f418c8f9f12ba424b7757de02bbdfbae0d4c4fdf9317c80cc5fe04c6429073466cf29706b8c25999ddd2f6540d4475cc977b87f4757be023f19b8f4035d7722886b78869826de916a79cf9c94cc79cd4347d24b567aa3e2390a573a373a48a5e676640c79cc70197e1c5e7f902fb53ca1858b6</pre>

On this page, users were invited to enter "Your school's domain name"—presumably intended to be their college alma mater. (At least in the beginning, only a few top-level domains were accepted.) If the user entered an acceptable domain (by xkcd's rules, which apparently changed during the 48 hours of the competition), he could then enter data values one at a time. For each data value entered, xkcd returned a hash value and the number of bits by which it differed from the target value. The object was to achieve the lowest possible number of differing bits, ideally zero.

A ranking page showed the lowest value achieved for each domain name entered, but not the data that achieved it. The first name on the list was substituted in various panels, and the third-place school showed in panel five. No data values were reported by xkcd, but various results were posted by users of the xkcd forums and on other websites, leading to copycat submissions, so that occasionally large numbers of institutions would show the same moderately low value.

After the end of the contest, the data submission page vanished, replaced by the final list of rankings, which shows that Carnegie Mellon University achieved the best score with 384 bits incorrect out of 1024. The rankings only show a few hundred out of the several thousand domains submitted—presumably Randall chose to chop the copycat submissions off the end of the list, retaining only honestly obtained results.

===First Panel===
In some cases, Megan's reply seems to correspond to the company.
{| class="wikitable table-padding"
|-
|
:Hey, [university] students!
:Have you applied to [company] yet?
:Megan: The recruiter hasn't emailed me back in over three minutes.
|-
|
:Hey, [university] students!
:Have you applied to [company] yet?
:Megan: The recruiter hasn't emailed me back in over an hour!
|-
|
:Hey, [university] students!
:Have you thought of a career at [company]?
:Megan: I'm not that good at math.
|-
|
:Hey, [university] students!
:Have you thought of a career at [company]?
:Megan: What do they even do?
|-
|
:Hey, [university] students!
:Have you thought of a career at [company]?
:Megan: I don't like monopolies.
|-
|
:Hey, [university] students!
:Have you thought of a career at [company]?
:Megan: Only in my darkest moments.
|-
|
:Hey, [university] students!
:Be part of the Apple experience!
:Megan: I'm not really a fan of turtlenecks.
|-
|
:Hey, [university] students!
:Come work at Microsoft!
:Megan: I only came to this tech talk for the xbox giveaway.
|-
|
:Hey, [university] students!
:Y U No Work Yahoo?
:Megan: I like working from home!
|-
|
:Hey, [university] students!
:Become a partner at Starbucks!
:Megan: But green's not my colour.
|-
|
:Hey, [university] students!
:Come work in the Amazon!
:Megan: I don't have to actually move to South America, do I?
|-
|
:Hey, [university] students!
:Have you thought of a career at [company]?
:Megan: Not after that presentation.
|-
|
:Hey, [university] students!
:Thought about working for Intel?
:Megan: I'm not that great at division.
|-
|
:Hey, [university] students!
:Dude, you should work at Dell!
:Megan: That catchphrase is so old.
|-
|
:Ahoy, carnegie melonites!
:Have you thought of a career at [company]?
:Megan: Not after that presentation.
|-
|
:Hey, [university] students!
:Have you looked for a job at Kraft Foods?
:Megan: I'm allergic to sugar
|-
|
:Hey, [university] students!
:How about working for Whole Foods?
:Megan: Could I afford the food if I did?
|-
|
:Hey, [university] students!
:Come work at EBay!
:Megan: Maybe if they made a good bid.
|-
|
:Hey, [university] students!
:Come work for Activision... er... Blizzard... er...
:Megan: Activision Blizzard?
|-
|
:Hey, [university] students! <nowiki>|</nowiki> Ahoy. Carnegie Melonites!
:Come find your future at Baidu!
:Megan: But nothing about Tiananmen Square.
|}

===Second Panel===
The text in the second panel is based on the company in the first panel:
{| class="wikitable table-padding"
|-
|
:When the Singularity happens, it will happen here.
:Ponytail: [Company] has outgrown us.
:Men: It is time.
|-
|
:Think of ways to make things smaller and smaller!
:Ponytail: I'm worried mine is too big.
:Men: Yeahhh
|-
|
:Think of ways to make things smaller and smaller!
:Ponytail: But will it blend?
:Men: Yeahhh
|-
|
:You'll be part of a dynamic research team envisioning the future.
:Ponytail: It probably looks cool.
:Men: Yeahhh
|-
|
:You'll be creating the future of commerce platforms!
:Ponytail: More recommendations.
:Men: Yep.
|-
|
:You'll be an insignificant cog in our giant machine
:Ponytail: We should improve Notepad
:Men: Nah
|-
|
:We can't tell you what you'll be working on.
:Ponytail: [Confidential]
:Men: [Redacted]
|-
|
:You'll be an insignificant cog in our giant machine
:Ponytail: Needs more Bob.
:Men: Nah
|-
|
:You'll help set the future of the company
:Ponytail: Wait. You hired a college grad as the CFO?
:Men: Yeahhh
|-
|
:At Qualcomm, we know you're born mobile.
:Ponytail: Born mobile!
:Men: Texting!
|-
|
:Short or tall, we've got a grande job for you!
:Ponytail: How many job openings are there?
:Men: Ele-venti or so.
|-
|
:You'll help direct the future of nutrition
:Ponytail: Microwaveable toast
:Men: Delicious
|-
|
:Help us find and provide the best healthy, local, and sustainable products.
:Ponytail: Hey guys, how about kale cookies?
:Men: Sounds great!
|-
|
:We're the Classmates.com to Facebook's Craigslist.
:Ponytail: Maybe we should use game theory.
:Men: Why Bother?
|-
|
:Whatever. Come create the future of gaming!
:Ponytail: Call of Duty 14.
:Men: That's genius!
|-
|
:It takes great minds to stifle other great minds.
:Ponytail: Let's block Canada
:Men: Sounds good.
|}

===Third Panel===
{| class="wikitable table-padding"
|-
|
:We're a convenient four hour drive from New York City (15,000 hours by Roomba)
|-
|
:Only a short commuter flight away!
|-
|
:Travel to us by Roomba, we're *that* close!
|-
|
:We're so close you can get to us by Roomba.
|-
|
:Free Roomba rides every morning while you have coffee.
|-
|
:Your Roomba comes in black & slate, or white & silver
|-
|
:Just a short Roomba ride up the coast, try not to fall off.
|-
|
:We know what everyday life is like for your generation:
|}

===Fourth Panel===
{| class="wikitable sortable plainlinks table-padding"
|-
|
:Our recruiting team is on the lookup for promising young [university] graduates.
|-
|
:We hired a new recruiting startup to help us hire [university] students.
|-
|
:We borrowed the botanical gardens' net to catch promising recruits.
|-
|
:We prefer to recruit from [university] students, of course.
|-
|
:Our recruiters are on the hunt for unaware [university] graduates.
|}

===Fifth Panel===
{| class="wikitable table-padding"
|-
|
:Or students from [university], if they're clever with their applications
|-
|
:Possibly [university] grads, if their form-filling startup works out.
|-
|
:Or [university] graduates, provided any of them manage to fill out the application correctly.
|-
|
:Or [university] graduates, if they manage to fill out the application correctly.
|}

The text in the form varies independently of the text at the top, sometimes related to the organization in 3rd place:

{| class="wikitable table-padding"
|-
!Organization
!Name
!Email
!Education
|-
|MIT
|Oliver Smoot
|pgp encrypted
|have you ever really looked at the fourier
|-
|
|Wheeeee
|ford.com
|stealing lunches from startups
|-
|CMU
|leeroy jenkins
|me@car
|I can cut up melons
|-
|CMU
|pittsburgh
|me@car
|I can cut up melons
|-
|
|SEGMENTATION FAULT
|save trees
|Contra dancing.
|-
|Cambridge
|I'm applying
|cam.gov
|on going problems with birds
|-
|
|certainly
|elephant
|An excellent year in the Sahara
|-
|Stanford
|Stanford
|ford.com
|Stealing lunches from startups
|-
|Stanford
|Yes Please
|@twitter
|Are you Stanford?
|-
|
|Applying
|For a job
|I would like to work at you
|-
|St.Olaf
|Me olaf
|You Helga
|Hunting wooly mammoths
|-
|Ohio State
|Oh!
|IO
|O HAI O
|-
|
|FOLLOWBACK
|TOTALLY.EDU.US
|CONVENIENT US DOMAIN REDIRECTS
|-
|
|Mancher
|Outlook
|Made a collage out of macaroni
|-
|Stanford
|Yes Please
|ford.com
|Are you Stanford?
|-
|Michigan
|ANN
|SOUTH DETROIT
|HUNT LIKE A WOLVERINE
|-
|
|christopher
|POBox 12532
|p.s. ill find my frog
|-
|Oxford
|Bond, James
|Righto
|We're better than Cambridge
|-
|
|Which one
|Forget it
|Riding the L all night long
|-
|Kit
|Kat
|Oh dear
|Something something sleep
|-
|Google
|My G+ handle?
|Any
|I'm feeling lucky
|-
|UIC
|Which one
|Forget it
|Riding the L all night long
|-
|
|MY JOB NOW
|@
|SAVE DOCUMENT AND SEND
|}

===Sixth Panel===
{| class="wikitable table-padding"
|-
|
:At [company], you'll work at a scale you won't find anywhere else
|-
|
:Explore the depths of expensive and undocumented tools!
|-
|
:At Apple, we believe in pushing the boundary of perfection.
|-
|
:At Microsoft, you just need to relax and embrace the machine 
|-
|
:Yahoo management aren't just suits. We code too!
|-
|
:At [company], you'll have the opportinity to work on cutting-edge projects.
|-
|
:At Amazon, you'll be shaving the most cutting-edge of yaks.
|-
|
:You get to bid first on any auction, and use other experimental tools!
|-
|
:At QUALCOMM, Device driver code quality is job #1
|-
|
:Make use of our powerful in-house game creation tools.
|-
|
:We're even working on some experimental biotechnology
|}

===Seventh Panel===
{| class="wikitable table-padding"
|-
|[[File:externality-dog1.png]]
|-
|[[File:externality-dog2.png]]
|-
|[[File:externality-dog3.png]]
|-
|[[File:externality-dog4.png]]
|-
|[[File:externality-dog5.png]]
|-
|[[File:externality-dog6.png]]
|-
|[[File:externality-dog7.png]]
|-
|[[File:externality-dog8.png]]
|-
|[[File:externality-dog9.png]]
|-
|[[File:externality-dog10.png]]
|-
|[[File:externality-dog11.png]]
|-
|[[File:externality-dog12.png]]
|-
|[[File:externality-dog13.png]]
|-
|[[File:externality-dog14.png]]
|}

==Title Text==
The title text documents the different sources of data in the comic. The different title texts are:

{| class="wikitable table-padding"
|-
!Comic region
!Title text
|-
|Most of the comic, during the competition.||Mouse over words and things to see where they come from.
|-
|Most of the comic, after the competition ended||This comic went up on April 1st, and the panels changed throughout the day in response to readers doing things like breaking hashes, edited a rapidly-shuffling set of target Wikipedia articles, and donating to Wikimedia Foundation. (The vandalism is over now and CMU won the hashing contest.)
|-
|Most of the text in the first panel.||Happy April 1st, Everyone!
|-
|Fifth panel.||[University] has the third best hash. See the full standings at http://almamater.xkcd.com/best.csv
|-
|Last panel.||The dog gains a pound for every $10 donated to the wikimedia foundation via this link. Currently at [amount donated]
|}

==Transcript==
:[The comic is dynamically generated from multiple sources.]

:[First panel [[1193: Externalities#First Panel|transcript varies.]]]

:[Second panel [[1193: Externalities#Second Panel|transcript varies.]]]

:[Third panel [[1193: Externalities#Third Panel|transcript varies.]]]
:[Ponytail riding on a roomba.]

:[Fourth panel [[1193: Externalities#Fourth Panel|transcript varies.]]]
:[A group of people waiting outside a door. One of them is holding a large net.]

:Or [university] graduates, provided any of them manage to fill out the application correctly.
:Name: [random]
:Email: [Third place university]

:[Sixth panel [[1193: Externalities#Sixth Panel|transcript varies.]]]
:Cueball: What does "make dog" do?
:Off-panel: Experimental dog generator. Don't click on it; the default size isn't set, so-
:'''*click*'''

:''KZZZT''
:BIP
:Off-screen: Uh-oh.

:[Last panel's [[1193: Externalities#Seventh Panel|transcript varies.]]]

==Final Transcript==
:This is a dynamic image with several different mouse-overs. Mouse-overs for specific panels are included here.

:Ahoy, Carnegie Melonites! Come find your future at Baidu.
:[Megan with black hair stands in a blank void.]
:Megan: But nothing about Tiananmen Square.
:[Mouse-over: Happy April 1st, everyone!]
:[There is a link on this panel to almamater.xkcd.com.]

:It takes great minds to stifle other great minds.
:[Ponytail sits at a desk with two other people.]
:Ponytail: Let's block Canada
:Others: Sounds good.

:We're a convenient four hour drive from New York City (15,000 hours by Roomba.)
:[Ponytail crouches on a moving Roomba with a steaming mug of coffee in one hand and a smartphone in the other.]
:''whirrrrrrr''

:Our recruiters are on the hunt for unaware CMU graduates
:[Megan approaches three students with a giant net as they leave a classroom.]

:Or UIC graduates, provied any of them manage to fill out the application correctly.
:[A website application which reads:]
::Name: WHICH ONE
::Email: FORGET IT
::Education: RIDING THE L ALL NIGHT LONG
:[Mouse-over: uic has the third best hash. See the full standings at http: almamater.xkcd.com best.csv]

:At Baidu, Inc., you'll have the opportunity to work on cutting-edge projects.
:[Cueball sits at a computer.]
:Cueball: What does "make dog" do?
:Off-screen person: Experimental dog generator. Don't click on it; the default size isn't set, so-
:'''*click*'''

:[Cueball stares at the screen.]
: ''KZZZT'' *bip*
:Off-screen: Uh oh.

:[A giant dog looks down at the desk where the computer once was, Cueball in the chair stares up at it.]
:[Mouse-over: The dog gains a pound for every $10 donated to the Wikimedia Foundation via this link. Currently at $51135.33.]
:[A graphic showing two sliders and a dog. Next to the dog with arrows pointing to it are a thermometer graphic and the equation d(x)=R.] CAREERS@BAIDU, INC. PLAY GOD WITH DOGS (TM)
:There are arrows over and under "GOD" and "DOG" indicating that you switch the letters.
:The previous three panels link to the special Wikimedia fundraiser page.

{{comic discussion}}
[[Category:Comics featuring Megan]]
[[Category:Comics featuring Ponytail]]
[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Hairy]]
[[Category:Dynamic comics]]
[[Category:April fool's comics]]

701: Science Valentine

2014-02-23T18:25:45Z

108.162.221.91: Removed the incomplete tag as the issue has now been addressed.

{{comic
| number = 701
| date = February 12, 2010
| title = Science Valentine
| image = science_valentine.png
| titletext = You don't use science to show that you're right, you use science to become right.
}}

==Explanation==
[[Cueball]] is taking a scientific approach to creating a valentine card. Based on the first chart, the recipient may be his fiancée or spouse. However, his rigorous approach makes him realize that the happiness he derives from the relationship is declining, which presents him with a choice. Will he be a true scientist by accepting data that he doesn't like, or will he be romantic and just make a cute card? He decides that he is a scientist and so presents his significant other with a breakup valentine. The card has a heart on it crossed by a graph with a negative trend, forming the stereotypical torn heart and showing the decline of his feelings.

The title text seems to be him trying to console himself that he did the right thing.

==Transcript==
:I wanted to make you a science valentine
:with charts and graphs of my feelings for you.
:[A graph shows romance and happiness. Romance cuts off, indicating a breakup before the meeting of Cueball and his current significant other, and happiness dips accordingly.
:A line indicates where the couple first met; romance is jagged thereafter, initially upwards but later down.
:Happiness climbs slightly more steadily and then dips again.
:More lines indicate a period of dating and then one of engagement.]
:and the happiness you've brought me.

:But the more I analyzed
:[Cueball works at a computer.]
:r0 = 0.20
:r1 = -0.61
:r2 = -0.83
:the harder it became to defend my hypothesis.

:In science, you can't publish results you know are wrong
:and you can't withhold them because they're not the ones you wanted.

:So I was left with a question: do I make graphs because they're cute and funny,
:[Cueball sits, looking at a sheet of paper.]
:or am I a ''scientist?''

:Enclosed are my results.
:I hope you can find somebody else
:[A jagged, declining graph is superimposed over a red heart.]
:to be your valentine.

{{comic discussion}}
[[Category:Comics with color]]
[[Category:Comics featuring Cueball]]
[[Category:Valentines]]
[[Category:Math]]
[[Category:Statistics]]
[[Category:Science]]

701: Science Valentine

2014-02-23T14:56:17Z

108.162.221.91: Added an explanation of the breakup indicated in the last panel.

{{comic
| number = 701
| date = February 12, 2010
| title = Science Valentine
| image = science_valentine.png
| titletext = You don't use science to show that you're right, you use science to become right.
}}

==Explanation==
{{incomplete|Cueball breaks up with his girlfriend at the end. This is clearly seen at the last panel.}}
[[Cueball]] is taking a scientific approach to creating a valentine card. Based on the first chart, the recipient may be his fiancée or spouse. However, his rigorous approach makes him realize that the happiness he derives from the relationship is declining, which presents him with a choice. Will he be a true scientist by accepting data that he doesn't like, or will he be romantic and just make a cute card? He decides that he is a scientist and so presents his significant other with a breakup valentine. The card has a heart on it crossed by a graph with a negative trend, forming the stereotypical torn heart and showing the decline of his feelings.

The title text seems to be him trying to console himself that he did the right thing.

==Transcript==
:I wanted to make you a science valentine
:with charts and graphs of my feelings for you.
:[A graph shows romance and happiness. Romance cuts off, indicating a breakup before the meeting of Cueball and his current significant other, and happiness dips accordingly.
:A line indicates where the couple first met; romance is jagged thereafter, initially upwards but later down.
:Happiness climbs slightly more steadily and then dips again.
:More lines indicate a period of dating and then one of engagement.]
:and the happiness you've brought me.

:But the more I analyzed
:[Cueball works at a computer.]
:r0 = 0.20
:r1 = -0.61
:r2 = -0.83
:the harder it became to defend my hypothesis.

:In science, you can't publish results you know are wrong
:and you can't withhold them because they're not the ones you wanted.

:So I was left with a question: do I make graphs because they're cute and funny,
:[Cueball sits, looking at a sheet of paper.]
:or am I a ''scientist?''

:Enclosed are my results.
:I hope you can find somebody else
:[A jagged, declining graph is superimposed over a red heart.]
:to be your valentine.

{{comic discussion}}
[[Category:Comics with color]]
[[Category:Comics featuring Cueball]]
[[Category:Valentines]]
[[Category:Math]]
[[Category:Statistics]]
[[Category:Science]]

159: Boombox

2014-02-22T19:18:37Z

108.162.221.91: /* Explanation */ Roxane only has 1 'n' in Cyrano, not 2. Fixed.

{{comic
| number = 159
| date = September 20, 2006
| title = Boombox
| image = Boombox.png
| titletext = And she's gonna feel like a jerk when she realizes it was actually Under Pressure.
}}

==Explanation==
We see [[Cueball]] declare his love for [[Megan]] in an oft-used setting, paying homage to similar events in classic literature, notably the "balcony scene" from {{w|William Shakespeare|William Shakespeare's}} play {{w|Romeo and Juliet}}, and a similar situation in {{w|Cyrano_de_Bergerac_(play)|Cyrano de Bergerac}}. In the former, Romeo, attempting to woo Juliet, stands beneath her balcony to profess his love for her. In the latter, an inarticulate cadet, Christian, professes his love for Roxane by arranging to use the words of a fellow soldier, Cyrano, who secretly also loves Roxane.

The 1989 movie "{{w|Say Anything...}}" contains a modern interpretation of this declaration of love, where {{w|John Cusack}} plays {{w|Peter Gabriel|Peter Gabriel's}} "{{w|In Your Eyes (Peter Gabriel song)#Say Anything...|In Your Eyes}}" on a boombox outside the house of the girl he likes.

Cueball is holding up a boombox (a self-contained semiportable stereo system, typically with cassette tape or CD player, and complete with integrated large speakers; extreme specimens could weigh up to 12 kg) which is playing music while Cueball declares his love for Megan. She first is startled, embarrassed, then eventually disgusted by the 1990 hit single {{w|Ice Ice Baby}} ([http://www.youtube.com/watch?v=rog8ou-ZepE&ob=av2e Video]) by {{w|Vanilla Ice}} playing on the boombox. Cueball then admits he is "not good at this," attempting to recreate the classic romantic scene, but utterly failing to play music suitable for such an event.

The "Under Pressure" reference in the title text refers to the fact that the music used in "Ice Ice Baby" is a sample of the bassline of "{{w|Under Pressure}}" by {{w|Queen (band)|Queen}} and {{w|David Bowie}}.

==Transcript==
:[Megan is looking out a second story window at Cueball holding a boombox over his head.]
:Cueball: MEGAN!
:Woman: Oh my god, I can't believe this is happening.
:Cueball: I LOVE YOU!
:Woman: Okay, that's great. Wait a second. Is... is that... Ice Ice Baby? What the hell?
:Cueball: I'm not very good at this.
:[Musical Notes.]

==Trivia==
*Vanilla Ice was referenced also in [[112: Baring My Heart]].

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

687: Dimensional Analysis

2014-02-09T23:02:41Z

108.162.221.91: /* Dimensional analysis */ Fixed the grammatical errors in the part about how to balance the equation.

{{comic
| number = 687
| date = January 11, 2010
| title = Dimensional Analysis
| image = dimensional_analysis.png
| titletext = Or the pressure at the Earth's core will rise slightly.
}}

==Explanation==
Cueball has a [[My Hobby|hobby]] - and that is to abuse {{w|dimensional analysis}} to obtain ridiculous correlations of uncorrelated events and constants. Here Cueball is teaching a class and uses this trick to ''convince'' his students that the {{w|Toyota Prius}} combined {{w|United States Environmental Protection Agency|EPA}} gas mileage is somehow connected to the constant {{W|Pi}} via the {{w|Planck energy}}, the pressure at the {{w|Inner_core|earths core}} and the width of the {{w|English Channel}}.

This comic makes fun of how scientists (often physicists) use dimensional analysis to quickly check if a given formula can possibly relate to a physical system or if there were some (obvious) mathematical errors in its derivation. Dimensional analysis here refers to the check if both sides of the equation arrive at the same physical unit if the units of all variables get plugged into the equation. This usually requires knowledge of the system of units and the relation between different physical units.

The comic uses the following equation to make fun of it:

(Planck energy) / (Pressure at the core of the earth) * (Prius combined EPA gas mileage) / (minimum width of the English Channel) = π

===Dimensional analysis===
The right hand side is dimensionless (The constant π = 3.14... by definition is the relation of two lengths, the circumference and the diameter of a circle). The left hand side requires to plug in the dimensions of the named physical quantities:

*Planck energy: given in Joules [J]
*Pressure at the core of the earth: Given in Pascals [Pa]
*Prius combined EPA gas mileage: miles/gallon, SI units: meters/litres [m/l]
*minimum width of the English channel: meters [m]

When plugged into the left hand side this amounts to:

[J / Pa * (m/l) / m] = [Nm / (N/m²) * (m/m³) / m] = 1

Using the following unit relations (this does not reduce units to the seven SI units, but does use some derived units):

*1 Joule = 1 Newton-meter [J] = [Nm]
*1 Pascal = 1 Newton per square-meter [Pa] = [N/m²]
*1 cubic-metre = 1000 litres [m³] = 1000 [l]

Note that for dimensional analysis constant factors are not taken into account. Here square brackets are used to denote dimensional analysis. In the above equation the unit of force (newton) as well as all the units of length (meter) cancel out each other.

Another aspect of the comic is, that sometimes dimension analysis of equations that were not derived but rather "made up" can provide insight. However, in reality such an equations would have to be somehow "motivated", which is more of an art than science and requires great experience in the field the equation should relate to. The presented equation combines values that have no immediate causal relation with each other, so it does not make sense. Furthermore, since the values have absolutely no causal relation to each other, the ratios presented are simple coincidence; despite Cueball's claim, building a better Prius would not cause any changes to the English Channel.

In addition, if a better Prius were built, with a higher gas mileage, the equation would only be accurate if one of the other quantities changed. A higher gas mileage could be balanced if the English Channel became wider thus explaining why Cueball states that England will drift to sea away from France.

The ''title text'' also refers to this, as a higher pressure at Earth's core could also balance the equation, keeping the result constant equal to Pi. The Planck energy is an absolute, however, so it is not mentioned as a way to balance the next version of Prius.

For such relations it is also true that many of them can be made up by searching for matching values for variables to derive at the wanted number finally. E.g. if it is desired to arrive at e instead of π on the comic-equation, this could be done by using a different car model and/or a different length measurement and/or a different pressure (e.g. by choosing a different planet) and/or some other arbitrary energy.

===Some numbers for this calculation===
The {{w|Planck energy}} is the only nearly exact value we do have. Compared to other Planck values it is very large (macroscopic).
E_planck = 1.956 x 109 J = 1.956 x 109 Nm

Pressure at the {{w|Inner_core#Temperature_and_pressure|core}} of the earth ranges from 330 to 360 gigapascals.
Using a simple value like this:
P_core = 350 GPa = 3.5 x 1011 N/m²

Prius combined {{w|Toyota_Prius#Fuel_economy_and_emissions|EPA gas mileage}}:
For the third generation (from 2010) the City mileage is 51 mpg and the Highway mileage is 48 mpg. But it is the [http://www.fueleconomy.gov/feg/Find.do?action=sbs&id=26425 combined EPA gas mileage] which is used in the equation and that is 50 mpg.
50 mpg => 13.2 miles per litre => 21,000,000 meter per m³

Minimum width of the {{w|English Channel}} is about
33.1 km or 33,100 meters.

Calculating from these values you will get π=3.54... that is pretty close to π=3.14... while using a Planck value. According to Cueball this will be within the experimental error (the combined error for all four numbers - none are exact numbers). For instance if you tried the ePrius you would probably get closer to that target - as the mileage in real life usually is somewhat lower than the value given - and that would reduce the result.

==Transcript==
:My Hobby:
:Abusing dimensional analysis

:[On a blackboard.]
:(Planck energy/Pressure at the Earth's core) x (Prius combined EPA gas mileage/Minimum width of the English Channel) = π

:[Cueball indicates this equation with a pointer in front of a class.]
:Cueball: It's correct to within experimental error, and the units check out. It must be a fundamental law.
:Student: But what if they build a better Prius?
:Cueball: ''Then England will drift out to sea.''

==Trivia==
*Interestingly, this sort of dimensional analysis is formalized by the so called {{w|Buckingham π theorem}}, where each dimensionless grouping is called a "Pi". Thus formally each grouping can be denoted as equal to "Pi", although this is a rather obscure pun in the context of the comic.
*The {{w|fine-structure constant}} α =~ 1/137 is a common known analogue in {{w|physics}}.
*This is another comic in the infrequent [[My Hobby]] series.

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

687: Dimensional Analysis

2014-02-09T20:37:04Z

108.162.221.91: Explained the different-Prius adjustments to the equation, including the title text.

{{comic
| number = 687
| date = January 11, 2010
| title = Dimensional Analysis
| image = dimensional_analysis.png
| titletext = Or the pressure at the Earth's core will rise slightly.
}}

==Explanation==
{{incomplete|Randall's solutions for a different Prius are not explained well.}}
This comic makes fun of how scientists (often physicists) use dimensional analysis to quickly check if a given formula can possibly relate to a physical system or if there were some (obvious) mathematical errors in its derivation. Dimensional analysis here refers to the check if both sides of the equation arrive at the same physical unit if the units of all variables get plugged into the equation. This usually requires knowledge of the system of units and the relation between different physical units.

The comic uses the following equation to make fun of it:

(Planck energy) / (Pressure at the core of the earth) * (Prius combined EPA gas mileage) / (minimum width of the English Channel) = π

===Dimensional analysis===
The right hand side is dimensionless (The constant π = 3.14... by definition is the relation of two lengths, the circumference and the diameter of a circle). The left hand side requires to plug in the dimensions of the named physical quantities:

*Planck energy: given in Joules [J]
*Pressure at the core of the earth: Given in Pascals [Pa]
*Prius combined EPA gas mileage: miles/gallon, SI units: meters/litres [m/l]
*minimum width of the English channel: meters [m]

When plugged into the left hand side this amounts to:

[J / Pa * (m/l) / m] = [Nm / (N/m²) * (m/m³) / m] = 1

Using the following unit relations (this does not reduce units to the seven SI units, but does use some derived units):

*1 Joule = 1 Newton-meter [J] = [Nm]
*1 Pascal = 1 Newton per square-meter [Pa] = [N/m²]
*1 cubic-metre = 1000 litres [m³] = 1000 [l]

Note that for dimensional analysis constant factors are not taken into account. Here square brackets are used to denote dimensional analysis. In the above equation the unit of force (newton) as well as all the units of length (meter) cancel out each other.

Another aspect of the comic is, that sometimes dimension analysis of equations that were not derived but rather "made up" can provide insight. However, in reality such an equations would have to be somehow "motivated", which is more of an art than science and requires great experience in the field the equation should relate to. The presented equation combines values that have no immediate causal relation with each other, so it does not make sense. Furthermore, since the values have absolutely no causal relation to each other, the ratios presented are simple coincidence; despite Cueball's claim, building a better Prius would not cause any changes to the English Channel.

In addition, if a better Prius were built, the equation would no longer be accurate, so one of the other quantities would have to be change to suit the equation. A higher gas mileage would require a wider English Channel or it would no longer be the same answer. The title text also refers to this, as a higher pressure at Earth's core would also cause the equation to equal pi.

For such relations it is also true that many of them can be made up by searching for matching values for variables to derive at the wanted number finally. E.g. if it is desired to arrive at e instead of π on the comic-equation, this could be done by using a different car model and/or a different length measurement and/or a different pressure (e.g. by choosing a different planet) and/or some other arbitrary energy.

===Some numbers for this calculation===
The {{w|Planck energy}} is the only nearly exact value we do have. And according to other Planck values it is small.
E_planck = 1.956 x 109 J = 1.956 x 109 Nm

Pressure at the {{w|Inner core|core}} of the earth.
Using a simple value like this:
P_core = 350 GPa = 3.5 x 1011 N/m²

Prius combined {{w|Toyota Prius|EPA gas mileage}}:
Highway
US units 50 mpg
50 mpg => 13.2 miles per litre => 21,000,000 meter per m³

Minimum width of the English Channel is about
34km or 34,000 meters.

Calculating from these values you will get π=3.45... what is pretty close to π=3.14... while using a Planck value. Just try the ePrius and you will come closer to that target.

==Transcript==
:My Hobby:
:Abusing dimensional analysis

:[On a blackboard.]
:(Planck energy/Pressure at the Earth's core) x (Prius combined EPA gas mileage/Minimum width of the English Channel) = π

:[Cueball indicates this equation with a pointer in front of a class.]
:Cueball: It's correct to within experimental error, and the units check out. It must be a fundamental law.
:Student: But what if they build a better Prius?
:Cueball: ''Then England will drift out to sea.''

==Trivia==
*Interestingly, this sort of dimensional analysis is formalized by the so called {{w|Buckingham π theorem}}, where each dimensionless grouping is called a "Pi". Thus formally each grouping can be denoted as equal to "Pi", although this is a rather obscure pun in the context of the comic.
*The {{w|fine-structure constant}} α =~ 1/137 is a common known analogue in {{w|physics}}.
*This is another comic in the infrequent [[My Hobby]] series.

{{comic discussion}}
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