explain xkcd - User contributions [en]

3082: Chess Position

2025-08-25T12:42:27Z

GmRionWdTSEHT: I don't think assuming that the king was under attack is a helpful way of interpreting what Cueball says, and them playing a variant of chess isn't that likely an explanation.

{{comic
| number = 3082
| date = April 28, 2025
| title = Chess Position
| image = chess position 2x.png
| imagesize = 740x598px
| noexpand = true
| titletext = It's important to learn the moves that take you into the vortex, but it's best not to study vortex itself too closely. Even grandmasters who have built up a tolerance lose the ability to play for a few hours after studying it.
}}

==Explanation==
{{incomplete|The various paragraphs are not organised. Also, might need to reduce the focus on describing the scene and focus more on explaining the jokes.}}

[[Cueball]] talks to [[Ponytail]] about a chess game he had last week against [[Knit Cap]]. After Cueball made a {{w|blunder (chess)|blunder}}, a critically bad mistake which frequently changes the course of the game, both of them quickly made inaccurate moves, probably rated as a "{{w|Blunder (chess)|blunder}}", "mistake", or "miss", leading to an odd configuration of the chess pieces. Blunders that are not taken advantage of can lead to this effect for less experienced players.

The rest of this comic becomes absurd, as Cueball then describes himself and Knit Cap descending into a fantasy world "on a deep branch of the game tree." However, it seems that Cueball and Knit Cap each made a sequence of seemingly obvious blunders that neither opponent then took advantage of, reaching a board configuration that Cueball had never even anticipated happening. Ponytail reacts nonchalantly to this story, as she says this is a common scenario for new players, and that there is even a defined name for it: the Kasparov Vortex Gambit. Ponytail's advice to Cueball after he "recovers" from the disillusionment of the "vortex" is that she can teach him how to defend against the attack, by using the f pawn.

Chess strategy is commonly described in terms of following a {{w|decision tree}} or {{w|game tree}}, as one usually needs to calculate multiple moves ahead when planning out what move to play. As a chess game progresses, the {{w|phase space}} of possible positions increases wildly, though this will include many more configurations than are typically seen or anticipated by players. Rarely, an expert player may 'discover' a truly clever {{w|Glossary of chess#theoretical novelty|novel opening}}, but centuries of recorded gameplay has explored many of the possible moves, both good and not so good, that are often recognized by experienced students of the game as common stepping-stones on the way to possible victory (or frequent traps that send the unwary down the road to defeat). Both precise game-board states and more general variations may be easily recognized by an experienced player, and even be {{w|Checkmate pattern|given a name}} by the player community as a whole.

In some apparently mystical (or at least psychological) manner, by travelling such an unlikely and unfamiliar branch of the player/board game-space, the precise positioning of pieces combined with the state of mind that Cueball had developed created the impression of literally entering a mythical garden, with time even stopping. This could be a reference to the story "The door behind the wall" by HG Wells in which the protagonist explains to the personal that he is haunted by trying to find a door leading to a mystical garden, which he had stumbled across before. In chess, you want pieces to be in a position to attack other pieces, while at the same time being protected by other pieces. Typically you'd have some pieces on the offense, some playing defense, and some doing both. It seems that in this board configuration, somehow all the pieces ended up in both offensive attack positions able to attack every other piece on the board while at the same time each one was being protected by against attack by their other pieces. It was this perfect balance of position and protection that led to the time distortion and the magical garden.

This is impossible under standard rules. If all of the pieces are being attacked, that includes the king. It is illegal to end your turn with your king under attack; if you have no way to do so, the game ends, in checkmate if your king started the turn under attack or in stalemate if it did not. Alternatively, Cueball might not be including the king in "every piece", or simply might not have literally meant that every piece was under attack.

{{w|Garry Kasparov}} is a Russian chess grandmaster and former world champion. He was the number-one rated chess player from 1984 to 2005, and is considered one of the greatest chess players of all past time, if not ''the'' greatest. A {{w|gambit (chess)|gambit}} refers to a chess opening in which a player sacrifices material with the aim of achieving a subsequent positional advantage. This name seems to indicate that Kasparov himself either discovered/’invented’ or made popular this "gambit" to suck new players into a "vortex" and trap them from getting out. This is not the case, but, within the xkcd universe, he has performed an equally absurd gambit (also named after himself) in [[2936: Exponential Growth]].

The f pawn is the pawn that begins on the f file (the 6th column of the chessboard from white's perspective, which is designated with the 6th letter of the alphabet since rows are designated by numbers). The pawn would start either on f2 (sixth column, second row) for the white player or f7 (sixth column, seventh row) for black. The fact that an apparent distortion in the fabric of space can be countered with ''a single pawn'' just adds to the absurdity of the situation. Equally absurd is the fact that moving the f pawn early in the game is itself usually a blunder that exposes the king to a diagonal attack, due to its starting position relative to the starting position of the king; perhaps the intent is to purposefully "blunder" down a ''different'' (non-vortexed) branch of the game-tree with resulting board positions that are far less mesmerising (at least to Cueball).

In the title text, Ponytail continues with her advice, telling Cueball that he needs to understand how the vortex can be entered, but not to study the actual vortex. It appears that if you spend too much time focusing on the vortex you will [[356: Nerd Sniping|lose your ability]] to play chess. Even experienced players, such as grandmasters who have built up some kind of tolerance against the effect of the vortex, lose their chess abilities for a few hours after studying it. Thus being able to get your opponent into the vortex, without getting caught in it yourself, should win you the game, since they would lose their ability to play chess.

==Transcript==
:[In the first panel, Cueball is walking in from the left, while talking to Ponytail.]
:Cueball: Something odd happened to me last week in a game at the chess club.

:[Cueball is playing a game of chess against Knit Cap.]
:[Caption above frame:]
:I moved, then instantly realized I'd blundered. But my opponent didn't notice and made a weird move.
:I got rattled and moved almost randomly, then I think we both panicked and made a couple of nonsensical moves, rapid-fire.

:[Zoomed in on Cueball, with three question marks above his head]
:I don't know how it happened, but suddenly I realized I was staring at an indescribably strange board position.

:[Cueball is talking to Ponytail.]
:Cueball: I've never seen anything like it. It seemed like every move attacked every piece, yet every piece was also protected. Pieces refracted through crystalline pawn structures.
:Cueball: The game clock slowed and then stopped.

:[Cueball and Knit Cap are floating in a complex five-fold symmetrical plant-like pattern of "game tree branches".]
:[Caption above the frame]
:It didn't even feel like we were playing chess. We had stumbled into a magical garden tucked away on a deep branch of the game tree.

:[Cueball is talking to Ponytail.]
:Cueball: I don't remember how the game ended, if it did.
:Cueball: I don't remember how I got home.
:Cueball: It's all a blur.

:[Close-up of Cueball's head.]
:Cueball: I've spent all week trying to reconstruct the position and can't.
:Cueball: It's consuming me.
:Cueball: I don't want to play chess. I just want to return to that garden.
:Cueball: Does... any of this make sense to you?

:[Cueball is standing with hands on face surprised as Ponytail talks with him.]
:Ponytail: Yeah, that's the Kasparov Vortex Gambit. Common trap for new players.
:Cueball: ''What?!''
:Ponytail: Once you recover I'll show you how to block it with the f pawn.

{{comic discussion}}

[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Ponytail]]
[[Category:Comics featuring Knit Cap]]
[[Category:Chess]]

3074: Push Notifications

2025-04-11T13:09:51Z

GmRionWdTSEHT:

{{comic
| number = 3074
| date = April 9, 2025
| title = Push Notifications
| image = push_notifications_2x.png
| imagesize = 277x347px
| noexpand = true
| titletext = NOTIFICATION: Now dismissing a head of the Notification Hydra… NOTIFICATION: Success! You have dismissed a head of the Notification Hydra! Different title text: :3
}}
To experience the interactivity of the game, visit the {{xkcd|3074|original comic}}.

==Explanation==
{{incomplete|Please write a better overall explanation and explain the other functions of the comic. If you see any comic images that haven't been uploaded yet, please download and add them!}}
This interactive comic is the 15th [[:Category:April fools' comics|April Fools' Day]] comic released by Randall, just over a week late. It uses {{w|push notifications}} to change the comic image over time and make other statements.

Upon viewing the comic for the first time, a sequence of notifications will be rendered over the comic itself. The notifications have a fade-in animation and appear one after another. The sequence is divided into several "groups" of notifications, each containing up to 4 regular notifications and an interactable button, which has a circled arrow icon to the right as well as a different text color. Clicking the arrow removes all notifications on screen and proceeds the sequence to the next group.

At the end of the sequence, a red-background option to sign up for xkcd notifications is presented. This part differs depending on if the user is "playing" from a mobile or desktop browser.

On desktop, clicking this will result in the browser prompting the user to allow or block xkcd.com's request to send push notifications. By clicking allow, the game begins. If blocked, the comic shows a message "An actual error occured :(", and the laptop bursts into flames. Note that the laptop also blows up in response to any other browser error, such as a 500 Internal Server Error, which is reported to happen if you click the pause button too quickly.

On mobile, a new on-screen notification will show up, telling the user to add xkcd.com to their home screen in order for it to send push notifications on mobile. Upon doing so and opening the webpage from the home screen, the system will prompt the user to allow or block push notifications from this webpage. The outcomes of allowing and denying are the same as on desktop.

Once the game begins, you are provided with two buttons: one labeled "Emergency Stop" which will let you either end the game or sign up for real xkcd updates only, and one labeled "Silence notifications at a cost" which will silence notifications at the cost of notifying two random people.

Up to 7 clickable cats periodically spawn at predetermined positions around the page, including one on the edge of the Emergency Stop button.

For a table of all notification messages, see [[3074: Push Notifications/Table of Notifications]].

A general list of notification types include:
* A few starter notifications about this comic, the successful sending of a notification of this comic, and the lack of another comic.
* An announcement that an old comic was posted, specifying a (seemingly) random comic and its publication date. The publication date seems to be shown in a random {{w|Calendar date|calendar date format}}.
* A word game where a first notification asks you to type a word, with further notifications to be sent whenever someone chooses the same word as you.
** The word can be chosen by clicking on the first notification, which lands you in the comic page. The comic pane will be changed to a comic-style input dialogue with a space for the word and a submit button.
** Upon providing a word, a notification informs you that you will then receive notifications (of the form "Someone else has selected the word <Your Word>!"), and that your choice is permanent and cannot be changed.
** It is entirely possible to (mis-)submit a blank word, and to receive "Someone else has selected the word !" notifications.
* A "streak" notification counting the number of times you've clicked it. The message changes first every 10 clicks, then every 50 clicks (after 100) and then at increasing intervals. After every 50 clicks there is an offer to make future clicks count twice, making this a simple version of {{w|Cookie Clicker}}. If you choose to accept the offer by clicking on it, it will reset your clicks back to zero but makes all future clicks count double of the current click rate; you can also reject the offer by continuing to click on the click counter message. There are occasionally notifications encouraging you to keep clicking and "extend your streak," tempting you with "a free click to keep you going". After 400 clicks it will reset your clicks back to zero but makes all future clicks count four times.
** Early notifications encourage further clicking.
** Approaching a hundred, the messages grow more concerned and later start warning that the server will crash or has crashed.
** Above 750: "Are you just doing this to annoy me?"
** 1000-2000: "You're just doing this to annoy you?"
** Above 2000: "I guess it worked"
** Above 1000000: "Wow, you're really into this"
* A "have you seen my cat?" notification which causes all the cats to spawn when clicked.
* Cat fact notifications that appear when a cat is clicked, in reference to [https://i.kym-cdn.com/photos/images/original/000/241/756/e6e.png this exchange].
* Various "Erroneous Alerts" with a warning triangle {{w|emoji}} (⚠ U+26A0), some with just flavor text, some corresponding to changes in the comic image.
* "Zoom notifications" including numeric coordinates, sometimes prefixed with "oh look!"; plotting these coordinates creates an image that appears to be a turtle, which could be a reference to [[1416: Pixels]].
* "Constant reminders" with references to mathematical, physical, or some other constants. The constant values are stated to be "at the tone", likely in reference to {{w|Speaking clock|time-of-day phone services}}, which are live or recorded human voice services that tell you the exact time "at the third stroke" over the phone.
* A notification that offers to provide weather alerts for your location, which leads into a series of notifications asking whether you live in a named city. If none of the cities that it knows are selected, your location is set to the summit of {{w|Mount Washington}}.
* When the time is near a full hour or half-hour, that the current time is five o'clock.
* An invitation to subscribe to the "What if?" YouTube channel
* A notification with the heading "System Log" that reads (INFO): A user has paused notifications
** This notification presumably appears when a random user has pressed the "Silence notifications at a cost" button.
* A reminder to comment and subscribe. When click on it will redirect to one of various Wikipedia pages, including: {{w|Talk:Mathematics}}, {{w|Talk:Romance}}, {{w|Talk:Language}}, (presumably, as the fourth of the stated topics [[xkcd]] is about) {{w|Talk:Sarcasm}}, {{w|Talk:Alarm_fatigue}}, {{w|Talk:Boneless}}, {{w|Talk:Sitting}}, {{w|Category talk:Unix text editors}}, {{w|Talk:Robot}}, {{w|Talk:Jamming avoidance response}}, {{w|Talk:Squircle}}, {{w|Talk:Like}}, {{w|Talk:Drafting linen}}, {{w|Talk:Hot dog}}, {{w|Talk:Goomba}}, {{w|Talk:Tidal locking}}, {{w|Talk:Multiple unit}}, {{w|Talk:Flag semaphore}}, {{w|Talk:Stoating}}, {{w|Talk:Roseate_spoonbill}}, {{w|Talk:Teleportation}}, {{w|Talk:List of dumplings}}, {{w|Talk:List of hat styles}}, {{w|Talk:Cats and the Internet}}, {{w|Talk:Laminar flow}}, {{w|Talk:Time management}}, {{w|Talk:Hole}}, {{w|Talk:Spot welding}}, {{w|Talk:Myst}}, {{w|Talk:Agriculture in ants}}, {{w|Talk:East}}, {{w|Talk:Smoot}}.
* A "{{w|Carriage return|Carriage Return}} Line Feed", referencing the Windows standard of storing line returns as a carriage return character followed by a line feed (newline) character. However, the xkcd Carriage Return Line Feed is instead a news feed concerning the next stop on a supposed "Carriage Return Line" of a train system. The announcements are all related to stations on the {{w|London Underground}}, including the use of the phrase "{{w|Mind the gap}}".

The title text references the {{w|Lernaean Hydra}}, a multi-headed serpent-like monster from Greek mythology; the Greek hero {{w|Heracles}} was tasked with slaying the Hydra as {{w|Labours_of_Hercules#Second:_Lernaean_Hydra|the second of his twelve labours}}. When he cut off one of its heads, however, two heads would grow in its place, resulting in more heads than before; Heracles soon realized he could not kill the Hydra in this fashion.
The title text describes a similar situation with the "Notification Hydra": a push notification "head" of the Notification Hydra was dismissed, which subsequently spawned two more push notification heads providing updates about the status of the dismissal. If one of these new notifications were to be dismissed, it would again spawn another set of the same two push notification heads; thus, the Notification Hydra is unkillable in a manner similar to the original.

The subdirectory where the images and scripts for this comic are stored is titled 'marconi,' which is likely a reference to the Italian engineer and inventor of the same name, {{w|Guglielmo Marconi}}, who is credited with inventing the radio, and did much work in the field of early communication systems.

Clicking the "Emergency Stop" button allows you to either restart the full game or to subscribe just to notifications for new comics. Blocking notifications to just new comics at this stage will also result in [[Cueball]]'s laptop exploding.

===Gallery of comic images===
<gallery class="mw-collapsible mw-collapsed" widths=100px>
File:3074_normal.png|Cueball sitting at his desk, with his laptop.
File:3074_big_laptop.png|Cueball sitting at his desk, with a very large laptop.
File:3074_plant_small.png|Cueball sitting at his desk, with a small potted plant.
File:gallery_placeholder.png|Cueball sitting at his desk, with a squirrel in the pot.
File:3074_plant_big.png|Cueball sitting at his desk, with a much larger plant that has clearly outgrown the pot, at least vertically.
File:3074_big_plant_cat_A.png|Cueball sitting at his desk with the larger plant, with a cat on one of the branches.
File:gallery_placeholder.png|A second image of Cueball sitting at his desk with the larger plant with a cat on one of the branches, but in a different spot.
File:3074 Desk with Cat Foreground.png|Cueball sitting at his desk, with a cat in the foreground near the point of view.
File:3074_cat_chair.png|Cueball sitting at his desk, his chair replaced with a large cat.
File:3074_computer_fire.png|Cueball sitting farther back from his desk, with the laptop on the desk on fire.
File:3074_float.png|Cueball, the desk, and the laptop floating in the air.
File:3074_spin.png|Cueball spinning in his chair.
File:3074_desk_sit.png|Cueball sitting on the desk, facing the laptop on the chair.
File:3074_gameover.png|The desk vacant with "Game Over" displayed if you use the emergency stop.
File:3074_sword.png|Cueball sitting at his desk, with a laptop on the desk, and a sword leaning against the desk on the other side.
File:gallery_placeholder.png|Cueball and Ponytail swordfighting while the computer has an hourglass icon, referencing [[303: Compiling]].
File:3074_flooding.png|The room flooded 2/3 of the way up the desk. Cueball is still sitting with his laptop.
File:3074_sailboat.png|The same flooding, with a miniature sailboat behind Cueball.
File:gallery_placeholder.png|The same flooding, with a cat face behind Cueball.
File:3074_Flooded_Shark_Fin.png|The same flooding, with a shark fin on the far side of the desk, facing toward Cueball.
File:gallery_placeholder.png|Cueball kneeling on the chair, which is raised up higher than the desk, and leaning over to use the laptop.
File:gallery_placeholder.png|Cueball sitting at the desk, which has been extended behind his laptop like a long meeting table.
File:gallery_placeholder.png|No Cueball, only the chair, desk, and laptop.
File:gallery_placeholder.png|Cueball using the laptop on his lap, with no desk.
File:gallery_placeholder.png|Cueball with a squirrel on his head.
File:gallery_placeholder.png|A squirrel sitting at the desk, seemingly using the laptop.
File:gallery_placeholder.png|Cueball standing on top of the laptop keyboard.
File:gallery_placeholder.png|Cueball sitting at the desk, wearing a wizard hat.
File:3074_floor.png|Cueball sitting on the floor behind the desk.
File:3074_tentacles.png|Cueball sitting in his chair, shielding his face from a tentacle coming from the computer screen.
File:3074_cat.png|The cat that appears after returning to the comic window after leaving it idle for long period of time. It has a unique title text of ":3".
File:zoom_turtle.png|The turtle that appears when graphing coordinates from the Zoom Notifications.
</gallery>

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}
:[Cueball sits at a desk in an office chair. He is typing on a computer.]
:[Gray message boxes with a small circled “x” at the top right corner are shown:]
:Happy April 1st (observed)!
:To celebrate, we were excited to introduce a new xkcd.com feature: push notifications for new comics!
:Unfortunately, this feature has gone horribly wrong.
:Until further notice, we are asking people ''NOT'' to sign up for new comic notifications.
:Frankly, we recommend not even clicking on any notifications to learn more.
:''Click this notification to learn more!'' (a circled arrow is shown)

:“Push notifications for new comics” sounds like a simple feature, right?
:There’s a nice API for browser notifications. xkcd updates three times a week.
:So you just send a notification for each update, right?
:That’s what we thought, too.
:''Click to continue!'' (a circled arrow is shown)

:[To the side of the comic frame is a big, horizontal hexagonal stop sign]
:Sign: Emergency STOP
:Below the sign: ''Halt ALL notifications and forget everything''
:The good news is that we did build a button to stop xkcd new comic notifications.
:You can press this button at any time and the system will stop sending you notifications.
:The nightmare will be over and the server will forget you ever existed.
:This part definitely works.
:''The rest of the system does NOT work.'' (a circled arrow is shown)

:We’re sorry.
:We don’t know how things went so wrong.
:The system is sending more than three notifications a week. A LOT more.
:We cannot recommend signing up for xkcd new comic notifications at this time.
:''Click here to ignore the warnings.'' (a circled arrow is shown)

:No, really.
:Our notification system may send a large number of very real system notifications.
:These may flood your browser, displace other notifications, and cause problems.
:<big>⚠️DO NOT ENABLE XKCD NEW COMIC NOTIFICATIONS⚠️</big>
:''Yeah, I get it, but I definitely want to enable xkcd new comic notifications.'' (a circled arrow is shown)

:Are you sure?
:''Yes!'' (a circled arrow is shown)
:Absolutely sure?
:''YES!!'' (a circled arrow is shown)
:To enable push notifications on mobile you need to add xkcd.com to your home screen.

:''Click here to subscribe to xkcd notifications''

:[Initial static image shows Cueball sat on an office chair at a desk using a laptop computer. A notification 'window' is speech-bubbled above the computer]
:[Grey notification box, header:] April 1st (Observed)
:[Notification box, further text:] Open xkcd.com to view.
:Laptop: [Warning sign.]

:[When viewed live, various xkcd-style popover notifications appear, each can be dismissed or (usually the last on every page) invited to press an 'onwards'-style button.]

:[First page of messages]
:Happy April 1st! To celebrate, we were excited to introduce a new xkcd.com feature: Push Notifications for new comics!
:Unfortunately, this feature has gone horribly wrong.
:Until further notice, we are asking people NOT to sign up for new comic notifications.
:Frankly, we recommend not even clicking on any notifications to learn more.
:[Notification with 'onwards button':] ''Click on this notification to learn more''

:[Upon choosing to continue, further messages appear, replacing any prior ones left open]
:"Push Notifications for new comics" sounds like a simple feature, right?
:There's a nice API for browser notifications, xkcd updates three times a week.
:So you just send a notification for each upafte, right?
:That's what we thought, too.
:[Notification with 'onwards button':] ''Click on this notification to continue''

:[Next set of popover messages]
:The good news is that we did build a button to STOP xkcd new comic notifications.
:You can press this button at any time and the system will stop sending you notifications.
:The nightmare will be over and the server will forget you ever existed.
:This part definitely works.
:[Notification with 'onwards':] ''The rest of the system does not work.''
:[To the right of the comic frame, a red, octagonal button has white text upon it:]Emergency Stop
:[Below the button is red text:] Halt all notifications and forget everything

:[Next set of popovers, "stop" button remains permanently so long as you continue]
:We're sorry.
:We didn't know how things went so wrong.
:The system is sending more than three notifications at this time.
:['Onwards' notification:] ''Click here to ignore the warnings''

:[Next set.]
:No, really.
:Our notification system may send a large amount of very real system notifications.
:These may flood your browser, displace other notifications, and cause problems.
:[Text bookended by warning triangles:] Do not enable xkcd new comic notifications
:['Onwards':] Yeah, I get it, but I definitely want to enable xkcd new comic notifications

:[Just two popovers, initially]
:Are you sure?
:['Onwards':] Yes
:[On clicking onwards, two more appear below]
:Absolutely sure?
:['Onwards':] Yes!!
:[On clicking, a further popover]
:[Red-tinted 'onwards'-style popover with warnings:] Click here to subscribe to xkcd notifications.

:[...something appeared then dissappeared...]
:[Genuine(?) browser dialogue activated:] xkcd.com wants to send you notifications. Block / Allow

:[If allowed, one more popover in the original style]
:Success!!
:[Below the Emergency Stop button, an oval gray button appears labeled in white:] Silence notifications at a cost
:[Below that, in grey text:]Temporarily pause your notifications at the cost of notifying two random people.

:[Further changes include the contents of the pane, whether Cueball is sat at the laptop, whether the laptop is larger, or a pot-plant, whether there are cats in the frame, outside the frame, sat on the Stop buttons, whether Cueball is sat on a large cat instead of an office chair...]
{{comic discussion}}
[[Category:Interactive comics]]
[[Category:April fools' comics]]
[[Category:Comics featuring Cueball]]

3074: Push Notifications

2025-04-10T18:20:00Z

GmRionWdTSEHT:

{{comic
| number = 3074
| date = April 9, 2025
| title = Push Notifications
| image = push_notifications_2x.png
| imagesize = 277x347px
| noexpand = true
| titletext = NOTIFICATION: Now dismissing a head of the Notification Hydra… NOTIFICATION: Success! You have dismissed a head of the Notification Hydra! Different title text: :3
}}
To experience the interactivity of the game, visit the {{xkcd|3074|original comic}}.

==Explanation==
{{incomplete|Please write a better overall explanation and explain the other functions of the comic. If you see any comic images that haven't been uploaded yet, please download and add them! Also, a table might not be the most space-efficient way to display the different comic images; a gallery of images might be better.}}
This interactive comic is the 15th [[:Category:April fools' comics|April Fools' Day]] comic released by Randall, just over a week late. It uses {{w|push notifications}} to change the comic image over time and make other statements. A table of notifications can be seen at [[3074: Push Notifications/Table of Notifications]].

After viewing the comic for the first time, there is a sequence of notifications rendered over the comic itself. After clicking through these, you are provided with two buttons: one labeled "Emergency Stop" which will halt all notifications, and one labeled "Silence notifications at a cost" which will silence notifications at the cost of notifying two random people.

If you press silence notifications too much the laptop blows up. This happens because the POST request that is sent to the server is returned by a 500 Internal Server Error. This is a real error.

Up to 7 clickable cats periodically spawn (nonrandomly) all over the comic, including one on the edge of the Emergency Stop button.

Notification types include:
* Asking you to type a word, with further notifications to be sent whenever someone chooses the same word as you. Following this up changes the comic pane to a comic-style input dialogue with a space for the word and a submit button.
** Upon providing a word, a notification informs you that you will then receive notifications (of the form "Someone else has selected the word <Your Word>!"), and that your choice is permanent and cannot be changed.
** It is entirely possible to (mis-)submit a blank word, and to receive "Someone else has selected the word !" notifications.
* A few starter notifications about this comic, the successful sending of a notification of this comic, and the lack of another comic.
* An announcement that an old comic was posted, specifying a comic and its publication date.
* A "streak" notification counting the number of times you've clicked it. The message changes first every 10 clicks, then every 50 clicks (after 100) and then at increasing intervals, with the last new message name being at 2000 clicks. After every 50 clicks there is an offer to make future clicks count twice, making this a simple version of {{w|Cookie Clicker}}. If you choose to accept the offer by clicking on it, it will reset your clicks back to zero but makes all future clicks count double of the current click rate; you can also reject the offer by continuing to click on the click counter message. There are occasionally notifications encouraging you to keep clicking and "extend your streak," tempting you with "a free click to keep you going". After 400 clicks it will reset your clicks back to zero but makes all future clicks count four times.
** Early notifications encourage further clicking.
** Approaching a hundred, the messages grow more concerned and later start warning that the server will crash or has crashed.
** Above 750: "Are you just doing this to annoy me?"
** 1000-2000: "Are you just doing this to annoy you?"
** Above 2000: "I guess it worked"
* A "have you seen my cat?" notification which causes all the cats to spawn when clicked.
* Cat fact notifications that appear when a cat is clicked, in reference to [https://i.kym-cdn.com/photos/images/original/000/241/756/e6e.png this exchange].
* Various "erroneous errors" with a warning triangle, some with just flavor text, some corresponding to changes in the comic image.
** A "gravity malfunction" indicating a change to the floating image.
** An "Error 40¾" HTTP malfunction (with {{w|Zalgo text}} on the error code) indicating a change to the tentacle image.
** "I forgot whether I'm the server or the client."
** An error for not enough errors.
** An error for too many errors.
** A Kernel Panic indicating the Kernel can't remember what number comes after 38
** A notification claiming that your computer ballast needs emptying, along with the computer room being flooded
** "Your computer has encountered an error" indicating a change to the fire image.
** Error 418: {{w|Hyper Text Coffee Pot Control Protocol#Commands and replies|I'm a teapot}}.
** An error with the "computer size limiter", indicating the enlarged laptop image.
* "Zoom notifications" including numeric coordinates, sometimes prefixed with "oh look!"; plotting these coordinates creates an image that appears to be a turtle, apparently a reference to [[1416: Pixels]].
* "Constant reminders" stating what some constant will be "at the tone". (This is in reference to time-of-day phone services, largely obsolete since the popularization of the internet, which you could call to hear the exact time at a given tone.) There are also joke constants such as "your favorite number will be equal to 14," and some definitions are tautological or not related to the actual value of the constant. Constants include
** The silver ratio (1 + the square root of 2)
** The golden ratio (half of 1 + the square root of 5)
** Pi (the ratio between a circle's circumference and radius, and half of Tau)
** Zero (a real number)
** Your favorite number (14)
** The luminosity of the sun (L☉)
** {{w|Euler's constant}}
** "We are currently experiencing 3600±1 seconds per hour. Changes to this rate will be announced six months in advance." - Referencing {{w|Leap second#Procedure|standard Leap Second procedure}}
* A notification that offers to provide weather alerts for your location, which leads into a series of notifications asking whether you live in a named city. If none of the cities that it knows are selected, your location is set to the summit of {{w|Mount Washington}}.
* A reminder that the Earth spins at 1 rpd (rotation per day).
* A statement near an hour or half-hour time that the current time is five-o-clock somewhere.
* An invitation to subscribe to the "What if?" YouTube channel
* A notification with the heading "System Log" that reads (INFO): A user has paused notifications
* A reminder to comment and subscribe, leading to one of various Wikipedia pages, including: {{w|Talk:Mathematics}}, {{w|Talk:Romance}}, {{w|Talk:Language}}, (presumably, as the fourth of the stated topics [[xkcd]] is about) {{w|Talk:Sarcasm}}, {{w|Talk:Alarm_fatigue}}, {{w|Talk:Boneless}}, {{w|Talk:Sitting}}, {{w|Category talk:Unix text editors}}, {{w|Talk:Robot}}, {{w|Talk:Jamming avoidance response}}, {{w|Talk:Squircle}}, {{w|Talk:Like}}, {{w|Talk:Drafting linen}}, {{w|Talk:Hot dog}}, {{w|Talk:Goomba}}, {{w|Talk:Tidal locking}}, {{w|Talk:Multiple unit}}, {{w|Talk:Flag semaphore}}, {{w|Talk:Stoating}}, {{w|Talk:Roseate_spoonbill}}, {{w|Talk:Teleportation}}.
* A "{{w|Carriage return|Carriage Return}} Line Feed", referencing the Windows standard of storing line returns as a carriage return character followed by a line feed (newline) character. However, the xkcd Carriage Return Line Feed is instead a news feed concerning the next stop on a supposed "Carriage Return Line" of a train system. The announcements are all related to stations on the {{w|London Underground}}, including the use of the phrase "{{w|Mind the gap}}".

The title text references the {{w|Lernaean Hydra}}, a multi-headed serpent-like monster from Greek mythology. In many stories, such as {{w|Labours_of_Hercules#Second:_Lernaean_Hydra|the second labour of Hercules}}, when one of its heads was cut off, two heads would grow in its place, resulting in more heads than before. Something similar has happened in the title text itself: there was a notification that was requested to be dismissed, and it created two more notifications notifying the user of the status of the dismissal.

The subdirectory where the images and scripts for this comic are stored is titled 'marconi,' which is likely a reference to the Italian engineer and inventor of the same name, {{w|Guglielmo Marconi}}, who is credited with inventing the radio, and did much work in the field of early communication systems.

Clicking the "Emergency Stop" button allows you to either restart the full game or to subscribe just to notifications for new comics.

===Gallery of comic images===
<gallery class="mw-collapsible mw-collapsed" widths=100px>
File:3074_normal.png|Cueball sitting at his desk, with his laptop.
File:3074_big_laptop.png|Cueball sitting at his desk, with a very large laptop.
File:3074_plant_small.png|Cueball sitting at his desk, with a small potted plant.
File:gallery_placeholder.png|Cueball sitting at his desk, with a squirrel in the pot.
File:gallery_placeholder.png|Cueball sitting at his desk, with a much larger plant that has clearly outgrown the pot, at least vertically.
File:gallery_placeholder.png|Two images with the larger plant that also have cats in the leaves.
File:gallery_placeholder.png|Cueball sitting at his desk, with a cat in the foreground near the point of view.
File:3074_cat_chair.png|Cueball sitting at his desk, his chair replaced with a large cat.
File:3074_computer_fire.png|Cueball sitting farther back from his desk, with the laptop on the desk on fire.
File:3074_float.png|Cueball, the desk, and the laptop floating in the air.
File:3074_spin.png|Cueball spinning in his chair.
File:3074_desk_sit.png|Cueball sitting on the desk, facing the laptop on the chair.
File:3074_gameover.png|The desk vacant with "Game Over" displayed if you use the emergency stop.
File:3074_sword.png|Cueball sitting at his desk, with a laptop on the desk, and a sword leaning against the desk on the other side.
File:gallery_placeholder.png|Cueball and Ponytail swordfighting while the computer has an hourglass icon, referencing [[303: Compiling]].
File:gallery_placeholder.png|The room flooded 2/3 of the way up the desk. Cueball is still sitting with his laptop.
File:3074_sailboat.png|The same flooding, with a miniature sailboat behind Cueball.
File:gallery_placeholder.png|The same flooding, with a cat face behind Cueball.
File:gallery_placeholder.png|The same flooding, with a shark fin on the far side of the desk, facing toward Cueball.
File:gallery_placeholder.png|Cueball kneeling on the chair, which is raised up higher than the desk, and leaning over to use the laptop
File:gallery_placeholder.png|Cueball sitting at the desk, which has been extended behind his laptop like a long meeting table.
File:gallery_placeholder.png|No Cueball, only the chair, desk, and laptop.
File:gallery_placeholder.png|Cueball using the laptop on his lap, with no desk.
File:gallery_placeholder.png|Cueball with a squirrel on his head.
File:gallery_placeholder.png|A squirrel sitting at the desk, seemingly using the laptop.
File:gallery_placeholder.png|Cueball standing on top of the laptop keyboard.
File:gallery_placeholder.png|Cueball sitting at the desk, wearing a wizard hat.
File:3074_floor.png|Cueball sitting on the floor behind the desk.
File:3074_tentacles.png|Cueball sitting in his chair, shielding his face from a tentacle coming from the computer screen.
File:3074_cat.png|The cat that appears after returning to the comic window after leaving it idle for long period of time. It has a unique title text of ":3".
</gallery>

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}
:[Cueball sits at a desk in an office chair. He is typing on a computer.]
:[Gray message boxes with a small circled “x” at the top right corner are shown:]
:Happy April 1st (observed)!
:To celebrate, we were excited to introduce a new xkcd.com feature: push notifications for new comics!
:Unfortunately, this feature has gone horribly wrong.
:Until further notice, we are asking people ''NOT'' to sign up for new comic notifications.
:Frankly, we recommend not even clicking on any notifications to learn more.
:''Click this notification to learn more!'' (a circled arrow is shown)

:“Push notifications for new comics” sounds like a simple feature, right?
:There’s a nice API for browser notifications. xkcd updates three times a week.
:So you just send a notification for each update, right?
:That’s what we thought, too.
:''Click to continue!'' (a circled arrow is shown)

:[To the side of the comic frame is a big, horizontal hexagonal stop sign]
:Sign: Emergency STOP
:Below the sign: ''Halt ALL notifications and forget everything''
:The good news is that we did build a button to stop xkcd new comic notifications.
:You can press this button at any time and the system will stop sending you notifications.
:The nightmare will be over and the server will forget you ever existed.
:This part definitely works.
:''The rest of the system does NOT work.'' (a circled arrow is shown)

:We’re sorry.
:We don’t know how things went so wrong.
:The system is sending more than three notifications a week. A LOT more.
:We cannot recommend signing up for xkcd new comic notifications at this time.
:''Click here to ignore the warnings.'' (a circled arrow is shown)

:No, really.
:Our notification system may send a large number of very real system notifications.
:These may flood your browser, displace other notifications, and cause problems.
:<big>⚠️DO NOT ENABLE XKCD NEW COMIC NOTIFICATIONS⚠️</big>
:''Yeah, I get it, but I definitely want to enable xkcd new comic notifications.'' (a circled arrow is shown)

:Are you sure?
:''Yes!'' (a circled arrow is shown)
:Absolutely sure?
:''YES!!'' (a circled arrow is shown)
:To enable push notifications on mobile you need to add xkcd.com to your home screen.

:''Click here to subscribe to xkcd notifications''

:[Initial static image shows Cueball sat on an office chair at a desk using a laptop computer. A notification 'window' is speech-bubbled above the computer]
:[Grey notification box, header:] April 1st (Observed)
:[Notification box, further text:] Open xkcd.com to view.
:Laptop: [Warning sign.]

:[When viewed live, various xkcd-style popover notifications appear, each can be dismissed or (usually the last on every page) invited to press an 'onwards'-style button.]

:[First page of messages]
:Happy April 1st! To celebrate, we were excited to introduce a new xkcd.com feature: Push Notifications for new comics!
:Unfortunately, this feature has gone horribly wrong.
:Until further notice, we are asking people NOT to sign up for new comic notifications.
:Frankly, we recommend not even clicking on any notifications to learn more.
:[Notification with 'onwards button':] ''Click on this notification to learn more''

:[Upon choosing to continue, further messages appear, replacing any prior ones left open]
:"Push Notifications for new comics" sounds like a simple feature, right?
:There's a nice API for browser notifications, xkcd updates three times a week.
:So you just send a notification for each upafte, right?
:That's what we thought, too.
:[Notification with 'onwards button':] ''Click on this notification to continue''

:[Next set of popover messages]
:The good news is that we did build a button to STOP xkcd new comic notifications.
:You can press this button at any time and the system will stop sending you notifications.
:The nightmare will be over and the server will forget you ever existed.
:This part definitely works.
:[Notification with 'onwards':] ''The rest of the system does not work.''
:[To the right of the comic frame, a red, octagonal button has white text upon it:]Emergency Stop
:[Below the button is red text:] Halt all notifications and forget everything

:[Next set of popovers, "stop" button remains permanently so long as you continue]
:We're sorry.
:We didn't know how things went so wrong.
:The system is sending more than three notifications at this time.
:['Onwards' notification:] ''Click here to ignore the warnings''

:[Next set.]
:No, really.
:Our notification system may send a large amount of very real system notifications.
:These may flood your browser, displace other notifications, and cause problems.
:[Text bookended by warning triangles:] Do not enable xkcd new comic notifications
:['Onwards':] Yeah, I get it, but I definitely want to enable xkcd new comic notifications

:[Just two popovers, initially]
:Are you sure?
:['Onwards':] Yes
:[On clicking onwards, two more appear below]
:Absolutely sure?
:['Onwards':] Yes!!
:[On clicking, a further popover]
:[Red-tinted 'onwards'-style popover with warnings:] Click here to subscribe to xkcd notifications.

:[...something appeared then dissappeared...]
:[Genuine(?) browser dialogue activated:] xkcd.com wants to send you notifications. Block / Allow

:[If allowed, one more popover in the original style]
:Success!!
:[Below the Emergency Stop button, an oval gray button appears labeled in white:] Silence notifications at a cost
:[Below that, in grey text:]Temporarily pause your notifications at the cost of notifying two random people.

:[Further changes include the contents of the pane, whether Cueball is sat at the laptop, whether the laptop is larger, or a pot-plant, whether there are cats in the frame, outside the frame, sat on the Stop buttons, whether Cueball is sat on a large cat instead of an office chair...]
{{comic discussion}}
[[Category:Interactive comics]]
[[Category:April fools' comics]]

232: Chess Enlightenment

2025-01-12T19:21:56Z

GmRionWdTSEHT: /* Explanation */

{{comic
| number = 232
| date = March 7, 2007
| title = Chess Enlightenment
| image = chess enlightenment.png
| titletext = You know that 'sweep the pieces off the board and see it in your mind' thing? Doesn't work.
}}

==Explanation==
In this comic, [[Cueball]] finds his game of chess against [[Megan]] to be too difficult, and he attempts to tap his subconscious to find his next move. This is a common technique used in more physical competitions like baseball or golf, where overthinking can interfere with one's motion and thus "clearing one's mind" and relying on the subconscious is useful to overcome such mental barriers. However, chess is more a game of planning and strategy than natural movement, and the rules of chess are not ingrained into Cueball's subconscious, and so his subconscious ends up feeding him invalid moves and beginner questions concerning movement rules.

{{w|Chess}} is a {{w|board game}} in which two players take turns to move a variety of {{w|Chess piece|different pieces}} representing units on a battlefield to try to {{w|checkmate}} the other player's {{w|King (chess)|king}}. Chess has a lively tournament scene, and it takes much practice to attain a {{w|Chess title|competent level of skill}} in the game. Different pieces can move and capture in different ways; {{w|Pawn (chess)|pawns}} can only move forward by one square unless it's their {{w|Chess opening|first move}}, in which case they can move up two squares. They can only capture by moving diagonally, including when capturing ''{{w|En passant|en passant}}'', in which case they move behind an opposing pawn that had moved forward two squares on the previous turn. Other pieces have different rules.

Cueballs subconscious instructs him to play the move "Knight to G-4". Chess uses a {{w|Algebraic notation (chess)|coordinate system}} to mark specific squares. The letters A through H represent the X line, and the numbers one through eight are the Y line. There are three reasons a {{w|Knight (chess)|Knight}} to G-4 could be an illegal move. The first being that the Knight couldn't travel to the space (as Knights movement is limited to a select few squares on any given turn). The second reason being that it could bring his King into {{w|Check (chess)|Check}}. If the Knight is {{w|Pin (chess)|blocking (or pinned by)}} something like a {{w| Rook (chess)|Rook}} from attacking the King, then moving the Knight and allowing the King to be attacked is illegal. The third reason would be that another piece of the same color is already in that square, which doesn't allow the Knight to move there.

{{w|Obi-Wan Kenobi}} is a character from the movie series ''{{w|Star Wars}}'' who played the mentor figure to the protagonist, {{w|Luke Skywalker}}. One of his pieces of advice to his mentee was to relax and listen to his subconscious in strenuous times. However, Obi-Wan gave this advice because Luke was connected to {{w|The Force}}, a mystical energy in the ''Star Wars'' universe that connects to the entire universe; not being a part of the ''Star Wars'' universe, Cueball is unable to tap into it. The Force does have similarities to real-life concepts used in various Eastern philosophies, but they are not typically used to play chess, for the same reasons given above.

The title text refers to a scene in the chess movie ''{{w|Searching for Bobby Fischer}}'', in which Sir Ben Kingsley's character dramatically sweeps the pieces off the board and instructs his student to see the pieces in his mind, which the child proceeds to do. Randall considers this impractical, presumably for similar reasons as the Obi-Wan example.

==Transcript==
:[Cueball and Megan are playing chess; Cueball is leaning forward over the chessboard.]
:Cueball (thinking): Why is chess so hard? Maybe the answers lie within me. Maybe I just need to let go, relax, and let my instincts and subconscious speak.

:[Cueball leans back and places his hands to his head.]
:''Meditate''

:Cueball's subconscious: Knight to G-4

:[Beat panel.]

:Cueball: That's not even a legal move.
:Cueball's subconscious: Okay, hold on. How do the pawns capture, again?
:Cueball: Man, Obi-Wan was full of crap.

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

1292: Pi vs. Tau

2024-12-31T20:58:49Z

GmRionWdTSEHT:

{{comic
| number = 1292
| date = November 18, 2013
| title = Pi vs. Tau
| image = pi vs tau.png
| titletext = Conveniently approximated as e+2, Pau is commonly known as the Devil's Ratio (because in the octal expansion, '666' appears four times in the first 200 digits while no other run of 3+ digits appears more than once.)
}}

==Explanation==
This is yet another of [[Randall]]'s [[:Category:Compromise|compromise comics]]. A few mathematicians argue as to whether to use {{w|pi}}, which is the ratio between a circle's circumference and its diameter, or {{w|Turn (angle)#Proposals for a single letter to represent 2π|tau}}, which is the ratio between a circle's circumference and its radius.

Some consider pi to be the wrong convention and are in favor of using tau as ''the'' circle constant; see the [http://tauday.com/tau-manifesto Tau Manifesto], which was inspired by the article "[http://www.math.utah.edu/~palais/pi.html Pi is wrong!]" by mathematician Robert Palais and [https://www.youtube.com/watch?v=5iUh_CSjaSw publicized by Vi Hart]. Others consider proponents of tau to be foolish and remain loyal to pi (see the [https://proper-pi-manifesto.com/ Pi Manifesto]). Of course, regardless of which convention is used, the change is merely in notation — the underlying mathematics remains unaltered. Still, the choice of pi vs. tau can affect the clarity of equations, analogies between different equations, and how easy various subjects are to teach.

Most people know π (pi) by the approximation 3.14, but do not know τ (tau) which, by definition, is twice as large as pi. Randall is suggesting using "pau", which is a {{w|portmanteau}} of "pi" and "tau", as a number situated, appropriately enough, halfway between pi and tau, i.e. 1.5 pi or 0.75 tau. But of course his number would be inconvenient, as this value does not naturally turn up when working with circles or other mathematical constructs, so there are no commonly used formulas that would use pau.

The title text claims that pau can be approximated by e+2, as both values are roughly 4.71 — a similarity that holds little since it requires another irrational constant, {{w|E (mathematical constant)|e}} (although knowing the value of pau is somewhat more helpful in remembering e to 2 digits.){{Citation needed}} It also attributes the nickname "Devil's Ratio" to pau, due to the sequence {{w|Number of the Beast|666}} supposedly appearing four times in the first 200 digits of pau when expressed in the {{w|octal}} base. However, this is not the case, and was likely due to an error in the computer system used by WolframAlpha; for more details see below.

The tau vs. pi controversy was later mentioned in [[2520: Symbols]].

==Transcript==
:[On the left is a "forbidden"-style slashed circle with the π symbol, captioned "Pi". On the right is a "forbidden"-style slashed circle with 2π, captioned "Tau". Between these is 1.5π, captioned "Pau".]
:[Caption below the panel:]
:A compromise solution to the Pi/Tau dispute

==Math details==
Possibly, [[Randall]] used [http://www.wolframalpha.com/ Wolfram|Alpha] to calculate the result (he uses it a lot, for example [http://what-if.xkcd.com/70/ What-if 70: The Constant Groundskeeper] or [http://what-if.xkcd.com/62/ What-if 62: Falling With Helium]).
However, when the comic was published, there was a bug in Wolfram|Alpha so that, when getting 200 octal digits from "pau", it just calculates the decimal value rounded to 15 significant digits (this is 4.71238898038469) and expands that as octal digits as far as needed.

This gives a periodically repeating number. In the first 200 digits of the octal expansion, the sequences 666 and 6666 do occur, twice and once, respectively. There are 4 occurrences, however, in the first three hundred and ten (310 in base 8 equals 200 in base 10) digits:
<pre>
4.554574376314416445676661714336617116240444076666510533533077631151350452060436452476274022621206136310000177621674175071262255702044274154476005744176002676623042402346036604733130522524127534777714554305412763636566643022106616734723661726160312772574551366370203115523402704104015532221722772357666</pre>
Expansion that long indeed does contain 666 (the {{w|Number of the beast|number of the beast}}) four times (with one instance as 6666). It also contains 0000, 222, 444, and 7777, but they only appear once in a run.

In the first 500 digits of the actual octal expansion of pau, we also find that 6666 occurs once, and 666 occurs two other times:
<pre>
4.55457437631441644323623451447505012242547157301565031476335452700304316771261165505467475703133125234035147165764643331727311243102010764472707236245737216402204376521550655442201431161557425156344621363625174410110777026111560241174471252241762037163367420573533032164702576626667446275343255043345060027305171025475041452166612112500275317166412767657355633417212140135534536541060452450664011414377406267077573054507036064406511117752700327100355213521015136220621644573043264505244325316526666260</pre>
(Note that this contains 500 digits after the octal point.) No other run of 3 or more repeated digits (e.g. 111) occurs as many times, although 1111 occurs once, 111 occurs once elsewhere, and 333 and 777 also occur once each. 9 other strings of 3 digits occur 4 times, namely 164, 362, 521, 644, 432, 730, 043, 216, and 450, and only 573 occurs more often, as it occurs 6 times. Therefore, if 6666 is counted as two occurrences of 666, it is actually the joint second most common string of three numbers in the first 500 digits.

{{w|Mathematical coincidence|Coincidentally}}, e+2 is also very similar to 1.5 pi, although only to a few digits.
<pre>
1.5π = 4.71238898038...
e+2 = 4.71828182845...
</pre>

==Trivia==
*For Pi, the sequence '666' occurs for the first time at position 2440. Many more occurrences can be found here: [http://www.angio.net/pi/ The Pi-Search Page].
*In the discussion it has been theorized that Randall used [[356: Nerd Sniping|nerd sniping]], in which case he was aware of the mistake in Wolfram!
*For an entertaining introduction to the concept of tau, see this [https://www.youtube.com/watch?v=jG7vhMMXagQ Vi Hart video].
*In March 2018 the video [https://www.youtube.com/watch?v=bcPTiiiYDs8 How pi was almost 6.283185...] was released on why Pi could just as well have been Tau (6.28), since {{w|Leonhard Euler|Euler}}, who used the letter Pi in his books, used it for both what we call Pi and Tau today... This very comic is also briefly shown in a segment regarding the controversy about these two versions of "Pi".
*Note that "pau" is Catalan for peace, which might make it a good solution for the pi/tau dispute.
*Also, note that "pau" is the Portuguese word for "stick", as well as, in Brazilian Portuguese, a very common slang for "penis". This may add to the humor (although childishly) for Portuguese-speaking readers, though it is fair to presume that it was not Randall's intention to do so.
*Pau is a Chinese dish, a filled bun which is round and yummy{{Citation needed}}, just like pie.{{actual citation needed}}
*[https://en.wikipedia.org/wiki/Pau,_Pyr%C3%A9n%C3%A9es-Atlantiques Pau] is also a city of south-western France.
*Finally, "pau" means "finished" in Hawaiian.

{{comic discussion}}

[[Category:Comics with color]]
[[Category:Math]]
[[Category:Compromise]]

1245: 10-Day Forecast

2024-12-31T20:45:40Z

GmRionWdTSEHT:

{{comic
| number = 1245
| date = July 31, 2013
| title = 10-Day Forecast
| image = 10 day forecast.png
| titletext = Oh, definitely not; they don't have Amazon Prime.
}}

==Explanation==
A 10-day forecast is a prediction of the weather extending 10 days into the future. Due to the chaotic nature of weather systems, the accuracy of forecasts decreases drastically the further ahead you try to predict.

When [[Cueball]] checks the forecast for his local area, it starts off predicting normal sunny weather, but quickly devolves into progressively extreme lightning storms, then a plague of insects which appear to be locusts, people whose legs appear to be extremely long panicking, and the appearance of a demon-like creature. Upon the arrival of the creature (perhaps {{w|The Antichrist}} or {{w|Woden}}) appearing, the forecast falls into static and nothingness with the day stuck on Tuesday, implying that the world has ended.

When asked about this, [[Megan]] casually explains that Cueball put a minus (-) sign in front of his ZIP code. A {{w|Zone Improvement Plan|ZIP code}} is a numeric postal code used in the United States. As ZIP codes are tied to a geographic location, it is also often used as an easy way for people to specify their local region for the purposes of weather reports.

Many computer systems that allow the user to enter a number have a range of applicability, such as positive numbers only. If the user enters a number that doesn't make sense, then the system must somehow deal with this number. Common ways to do this are to simply disallow the user from entering invalid numbers, or to return an error condition if the entered number is invalid. However, if the system has not been given any way to deal with an unexpected number, it will simply use it, which can result in unpredictable or erroneous behavior, such as accessing or overwriting unintended locations in memory.

When this kind of anomaly occurs in video games, particular older ones such as those on the {{w|Nintendo Entertainment System}}, it can result in levels being created from arbitrary data, producing a corrupted, physically-impossible (yet sometimes playable) level; this is popularly known as a "{{tvtropes|MinusWorld|Minus World}}". Because the level can be reproduced by using a particular invalid value, it is in some sense true to say that the level "exists" within the game, even though it was not intended.

In the comic, the joke is that somehow, "minus zipcodes" do exist, and do correspond to physical locations - but, by analogy with Minus Worlds in video games, are bizarre and incomprehensible places compared to the regular zip codes.

In the title text, Megan agrees with Cueball's desire not to move to that ZIP code area, the punchline being that her reason isn't to avoid the apocalypse, but to retain access to {{w|Amazon Prime}}, which shows that her priorities are amusingly bizarre. The service Amazon Prime is provided by {{w|Amazon.com|Amazon}},{{cn}} where the user pays a flat annual fee and in exchange they get access a number of "enhanced" Amazon services, including free two-day shipping, free access to a library of streaming videos, and the ability to borrow books.

Later, a [[1606: Five-Day Forecast|Five-Day Forecast]] was also made into a comic.

==Transcript==
:[Cueball sits behind a computer desk when Megan calls to him.]
:Megan (off-panel): Is it going to rain this weekend? I have a thing.
:Cueball: Lemme check.
:*type type*
:Cueball: ...Uhh. What?

:[A caption is written above ten small panels in two rows. In each panel is an indication of the weather. Below each panel a label tells which day it is referring too.]
:'''Your 10-day forecast:'''
:[A yellow sun.]
:Today
:[Two gray clouds in front of the sun.]
:Tomorrow
:[Thunderstorms, with three gray clouds and a single lightning bolt.]
:Friday
:[Extreme thunderstorms with many large gray clouds and seven lightning bolts]
:Saturday
:[A swarm of insects, with one large black one close by and seven others close enough to discern details. The rest of the swarm is grayed out and just shown as small dots behind these other eight insects.]
:Sunday
:[Images of distorted people with very long legs. One Megan, one Cueball and someone in the background.]
:Monday
:[A humanoid figure with two large horns or a winged helmet silhouetted against a bleak red background. The ground beneath the figure is black.]
:Tuesday
:[Grey static]
:Tuesday
:[Black screen]
:Tuesday
:[Black screen]
:Tuesday

:[Megan has entered the panel and stands behind Cueball looking at his laptop over his shoulder. She points to the screen. Cueball holds his hand to his chest.]
:Megan: ...Oh! You typed a minus sign in the ZIP code. The negative ZIP codes are all like that.
:Cueball: Let's ''never'' move there.

{{comic discussion}}

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