explain xkcd - User contributions [en]

Talk:3054: Scream Cipher

2025-02-24T13:16:38Z

Rei:

Anyone know a good free all-language OCR tool to help with the transcript? [[Special:Contributions/172.69.67.156|172.69.67.156]] 17:30, 21 February 2025 (UTC)
: Found one here: https://www.lexilogos.com/keyboard/diacritics.htm --mezimm [[Special:Contributions/172.68.2.70|172.68.2.70]] 17:52, 21 February 2025 (UTC)

The written cipher is very interesting, but where can I hear recordings of the spoken form? [[Special:Contributions/Rockymountain|Rockymountain]] 17:31, 21 February 2025 (UTC)
: [https://www.youtube.com/watch?v=eL4piuUn5nc Here ya go.] --mezimm [[Special:Contributions/172.68.35.117|172.68.35.117]] 17:54, 21 February 2025 (UTC)

Are Cueball and Megan millenials? Who else would text greetings when they're standing right next to each other? [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 17:38, 21 February 2025 (UTC)
:They could be texting other people. [[User:B_for_brain|B for brain]] ([[User_talk:B_for_brain|talk]]) ([https://www.youtube.com/@bforbrain youtube channel] [https://bforbrain.weebly.com/ wobsite (supposed to be a blag)]) 19:37, 21 February 2025 (UTC)
:Engineers and cyberfolk were text messaging their neighbors rather than talking long before it was <s>cool</s> encouraged for social distancing or quarantine! It's always helpful to get a reminder not to do this. [[Special:Contributions/162.158.159.101|162.158.159.101]] 20:37, 21 February 2025 (UTC)
:They might not be diegetically in the same room. Comics can get weird with physical space. [[User:GreatWyrmGold|GreatWyrmGold]] ([[User talk:GreatWyrmGold|talk]]) 20:34, 21 February 2025 (UTC)

Likely a pun on "stream cipher"

: Related reference: https://en.wikipedia.org/wiki/Scream_(cipher) [[Special:Contributions/172.68.26.229|172.68.26.229]] 17:46, 21 February 2025 (UTC)

A̦ÅÄ ẠÂÅȀ, A̓A̅ ȀÅÄĂA̱ ȦÁ ÂÁAĂĂA̦ A̮ÄÂÂA̦ A̓A̮ ȀÁ A̱A̓A̱ A ÀÁÂÃA̓ÅÂ ÅA̮ A̅A̰A̓Ã A̭AA̋Á A̓Â A̅A̰A̓Ã ÃA̅A̦ĂÁ! --mezimm [[Special:Contributions/172.68.3.112|172.68.3.112]] 17:50, 21 February 2025 (UTC)

:The Wikifunction [https://www.wikifunctions.org/view/en/Z22728 from Scream] returns "YOU KNOW, JA̅ WOULD BE NEALLY FUNNY JF WE DJD A VENSJON OF A̅HJS A̭AGE JN A̅HJS SA̅YLE!". Hmmm... [[User:Mwarren|Mwarren]] ([[User talk:Mwarren|talk]]) 19:04, 21 February 2025 (UTC)

::The page you link to came into existence 7 minutes after I had posted this comment ;) I was doing it all manually, using [https://www.lexilogos.com/keyboard/diacritics.htm this page] and best-guess attempts to interpret what Randall's handwritten diacritics were meant to correspond to. --mezimm [[Special:Contributions/172.68.1.158|172.68.1.158]] 19:55, 21 February 2025 (UTC)

::: updated version: "A̦ÅÄ ẠÂÅȀ, ẢĀ ȀÅÄĂA̱ ȦÁ ȂÁAĂĂA̦ A̮ÄÂÂA̦ ẢA̮ ȀÁ A̱ẢA̱ A ÀÁȂÃẢÅÂ ÅA̮ ĀA̰ẢÃ A̯AA̋Á ẢÂ ĀA̰ẢÃ ÃĀA̦ĂÁ!" --mezimm [[Special:Contributions/172.68.3.67|172.68.3.67]] 20:01, 21 February 2025 (UTC)

On Wikifunctions, we implemented the two functions [https://www.wikifunctions.org/view/en/Z22725 to Scream Cipher] and [https://www.wikifunctions.org/view/en/Z22728 from Scream Cipher] --[[Special:Contributions/172.70.38.235|172.70.38.235]] 18:09, 21 February 2025 (UTC)

:It looks like the wikifunctions are using a different character for "D" than [https://scream-cipher.netlify.app/ the github project] linked in the explanation. Seems as though one's using U+0331 and the other's using 0332. [[User:Schiffy|Schiffy]] ([[User_talk:Schiffy|Speak to me]]|[[Special:Contributions/Schiffy|What I've done]]) 20:32, 21 February 2025 (UTC)

Is there a logic behind the choices of the letter? I guess A̧ is for C because of the French ç and Å is pronounced like O in some Nordic languages. Also, is it A̱, A̲ or A̲ ? (or something else). [[Special:Contributions/172.71.126.50|172.71.126.50]] 18:10, 21 February 2025 (UTC)
: Seems to be mostly visual similarity. Å has an actual O shape added to it. [[Special:Contributions/172.70.110.171|172.70.110.171]] 20:19, 21 February 2025 (UTC)

I give it a week for people to make a translator to and from this cipher. [[User:CalibansCreations|'''Caliban''']] ([[User talk:CalibansCreations|talk]]) 18:20, 21 February 2025 (UTC)

: The Wikifunctions translations above were complete at least 11 minutes ''before'' your comment and well within the goal of one week :-) . [[User:Mwarren|Mwarren]] ([[User talk:Mwarren|talk]]) 19:04, 21 February 2025 (UTC)

Numbers should be variations of h and/or g. [[User:Andyd273|Andyd273]] ([[User talk:Andyd273|talk]]) 18:32, 21 February 2025 (UTC)#
:H > g [[User:SqueakSquawk4|SqueakSquawk4]] ([[User talk:SqueakSquawk4|talk]]) 18:59, 21 February 2025 (UTC)

Using ''sed'' you can encode with <code>sed 's/C/A̧/g;s/D/A̱/g;s/F/A̮/g;s/G/A̋/g;s/H/A̰/g;s/J/A̓/g;s/P/A̯/g;s/Q/A̤/g;s/X/A̽/g;s/Y/A̦/g;y/BEIKLMNORSTUVWZ/ȦÁẢẠĂǍÂÅȂÃĀÄÀȀȺ/'</code> and decode with <code>sed 's/A̧/C/g;s/A̱/D/g;s/A̮/F/g;s/A̋/G/g;s/A̰/H/g;s/A̓/J/g;s/A̯/P/g;s/A̤/Q/g;s/A̽/X/g;s/A̦/Y/g;y/ȦÁẢẠĂǍÂÅȂÃĀÄÀȀȺ/BEIKLMNORSTUVWZ/'</code>. [[Special:Contributions/162.158.159.102|162.158.159.102]] 18:41, 21 February 2025 (UTC)
: This is really neat. I suppose `tr` might work too. [[Special:Contributions/162.158.10.242|162.158.10.242]] 16:15, 22 February 2025 (UTC)
:: I don't think `tr` can be used, at least not the most common (GNU) implementation; it doesn't do multibyte characters (and thus UTF-8 or other Unicode). [[User:Chaw|chaw]] ([[User talk:Chaw|talk]]) 20:32, 23 February 2025 (UTC)
::: You'd be able to use Perl's inbuilt equivalent tr/// (or y///) fair enough. I'd have to test for edge cases, but might or might not have to fight with /u or /l post-params (if otherwise desired), in concatonation with /i for case-insensitivity (useful for upconverting "plainText" to "CIPHERTEXT", unless you're also wanting to cater for "á" as well as "Á" in code, so that it can be restored upon decoding). There's plenty of scope for all of this, of course, well beyond the brief spec as given in the comic. [[Special:Contributions/162.158.74.108|162.158.74.108]] 20:47, 23 February 2025 (UTC)

It would be really funny if someone added an image of Bill Cipher screaming, with the tag "A screaming cipher". It wouldn't reall fit but it'd be funny [[User:SqueakSquawk4|SqueakSquawk4]] ([[User talk:SqueakSquawk4|talk]]) 18:59, 21 February 2025 (UTC)
:[[File:Screamingcipher.png]] I did. [[User:B_for_brain|B for brain]] ([[User_talk:B_for_brain|talk]]) ([https://www.youtube.com/@bforbrain youtube channel] [https://bforbrain.weebly.com/ wobsite (supposed to be a blag)]) 19:57, 21 February 2025 (UTC) (EDIT: WOW, that thing is MASSIVE! Can someone please downscale it because I have no idea how. You have permission to edit my comment '''''only for that.''''') (DOUBLE EDIT: Nevermind, I did it.)
Someone started a GitHub repo with a web-based encoded/decoder already: https://github.com/Reginald-Gillespie/StreamCipher [[User:Dlech|Dlech]] ([[User talk:Dlech|talk]]) 19:35, 21 February 2025 (UTC)

I'd almost want to edit in my repo instead of the current one because mine is objectively better, but I'm new to this and not sure if that's appropriate or not =P (I don't even know if I am commenting correctly) [[User:WKoA|WKoA]] ([[User talk:WKoA|talk]]) 00:17, 22 February 2025 (UTC)
:Look to the likes of the [[1190: Time]] comic, where several different fanbase compilations may have been given. I would anticipate that you could do a decent job of editing "This thing here does..." into "Ways of experiencing it include this [existing one] and that [yours] [with room to add more, if they add up]. Or just mention your link here, let others decide if your claims of (better?) functionality stand up enough to prompt it to be put up alongside/ahead/instead of the other. I am at least intrigued as to how you did it differently.
:And you certainly had a bit of trouble with the signing. Just add <nowiki>~~~~</nowiki> to the end of Talk comments and it autoreplaces. No need to go back in and edit (I added the original timestamp back in, for you, just for future reference). Unless of course you forgot to do it the first time... ;) [[Special:Contributions/172.71.178.161|172.71.178.161]] 02:41, 22 February 2025 (UTC)

I know you can decode a substitution cipher by counting letters and replacing common ones like 'E' and then filling in the rest by inspection, but what kinds of automated approaches are there? [[Special:Contributions/162.158.159.105|162.158.159.105]] 20:14, 21 February 2025 (UTC)

'''HEADS UP:''' I just changed A̲ (0332 COMBINING LOW LINE) to A̱ (0331 COMBINING MACRON BELOW) as encoding for "D" in the table and the transcript. Rationale: "T" is written with macron, so it's only logical to encode "D" likewise. A "low line" is longer than a macron, and looking at Randall's comic, the line below the "D" is definitely not longer than the one above "T". It would also make no sense to encode "T" with a "combining low line" as well when a single, uncombined character exists. [[Special:Contributions/172.70.114.123|172.70.114.123]] 20:29, 21 February 2025 (UTC)
: These options should all be including as different writing styles! I think the longer line makes it clearer that A̲ represents D because the ink comes nearer to forming into a closed curve. [[Special:Contributions/172.68.54.68|172.68.54.68]] 15:55, 22 February 2025 (UTC)

What's the American alphabet? AnAussie [[Special:Contributions/172.68.64.213|172.68.64.213]] 01:16, 22 February 2025 (UTC)

I expect to win a Turing Award for my proof this cypher is computationally equivalent to https://en.wikipedia.org/wiki/Whitespace_(programming_language) [[Special:Contributions/172.71.158.19|172.71.158.19]] 02:57, 22 February 2025 (UTC)

The page technically uses the incorrect characters for (at least) E, M, N, O, R, S, and T based on the title text shown on xkcd.com. The original title text uses two separate characters (ex. A + 0301 COMBINING ACUTE ACCENT for E), whereas the table uses the combined character (ex. 00C1 LATIN CAPITAL LETTER A WITH ACUTE for E). Alternatively, my browser is just doing something weird. Not necessarily worth updating, but something I noticed when implementing the cipher. [[User:Abus|Abus]] ([[User talk:Abus|talk]]) 06:22, 22 February 2025 (UTC)
: I think it's the browser. Firefox->Page Source gives me A+COMBINING WHATEVER, but <code>w3m -dump_source https://xkcd.com/3054/ | zcat | grep 'img.*title='</code> returns single characters. The title text here on explainxkcd was copied by ''TheusafBOT''. I trust ''TheusafBOT'' and ''w3m'' to be so basic and simple that they wouldn't try to do something 'clever' with the characters, whereas I tend to suspect the multi-MB-monster Firefox messed things up. I'm just guessing, though... could maybe someone test with yet another browser - e.g. Edge or Opera? [[Special:Contributions/162.158.159.107|162.158.159.107]] 11:52, 22 February 2025 (UTC)
:: Argh, no, turns out ''w3m'', and also ''wget'' all return A+COMBINING THINGY, but they got merged into the single chars by my ''xterm'' when I copied them to some 'identify unicode' web page. Looking at the raw file dumped by ''wget'' I see A+COMBINING XX - I think... So I think you are right with your observation! Randall uses A+COMBINING XX for the title text on XKCD (though I really doubt that was intentional), then ''TheusafBOT'' merged the characters when it copied the text to create this page. That said, I still think using the merged chars is cleaner. [[Special:Contributions/162.158.159.107|162.158.159.107]] 12:20, 22 February 2025 (UTC)
::: It may be worth noting the difference somewhere, even though the merged chars are cleaner. Someone copying the characters from this page to encipher text would technically be in violation of the "spec" since Randall used the two character version in the title text. If someone wished to decipher the title text from the original XKCD, this characters on this page would fail. [[User:Abus|Abus]] ([[User talk:Abus|talk]]) 18:56, 22 February 2025 (UTC)
: unsure how to indent a sourceblock, see below [[Special:Contributions/172.68.54.167|172.68.54.167]] 16:13, 22 February 2025 (UTC)
<source>$ curl -s https://m.xkcd.com | sed -ne 's/.*id="altText">$[^<]*$<.*/\1/p' | iconv -f utf8 -t wchar_t | hexdump -C
00000000 41 00 00 00 41 00 00 00 41 00 00 00 41 00 00 00 |A...A...A...A...|
00000010 41 00 00 00 41 00 00 00 20 00 00 00 41 00 00 00 |A...A... ...A...|
00000020 20 00 00 00 41 00 00 00 03 03 00 00 41 00 00 00 | ...A.......A...|
00000030 27 03 00 00 41 00 00 00 41 00 00 00 11 03 00 00 |'...A...A.......|
00000040 41 00 00 00 26 03 00 00 20 00 00 00 41 00 00 00 |A...&... ...A...|
00000050 0c 03 00 00 41 00 00 00 0a 03 00 00 41 00 00 00 |....A.......A...|
00000060 02 03 00 00 41 00 00 00 03 03 00 00 41 00 00 00 |....A.......A...|
00000070 04 03 00 00 41 00 00 00 01 03 00 00 41 00 00 00 |....A.......A...|
00000080 11 03 00 00 20 00 00 00 41 00 00 00 41 00 00 00 |.... ...A...A...|
00000090 41 00 00 00 41 00 00 00 41 00 00 00 41 00 00 00 |A...A...A...A...|
000000a0 41 00 00 00 21 00 00 00 0a 00 00 00 |A...!.......|</source>

'''TRIARESIS'''
Does anyone else view the triaresis as a missed opportunity? I'm thinking of Die Aerzte". [https://en.wikipedia.org/wiki/Die_%C3%84rzte#Band_name]. Can someone insert the image of the band's logo? [[Special:Contributions/172.71.102.222|172.71.102.222]] 17:21, 22 February 2025 (UTC)
:I saw that, when following up on the actual A-diaresisand I quite like the idea that they {{tvtropes|HeavyMetalUmlaut|heavy metal umlauted}} an ''actual'' existing umlaut/diaeresis... If it weren't irrelevent to the comic (and skipped the bit at the top that actually translates the name), I might have relinked to that anchor point. But happily boosting the visibility of it here with a small reply⋯ [[Special:Contributions/172.68.205.122|172.68.205.122]] 21:31, 22 February 2025 (UTC)

Yes, should encode all numbers, in binary, using 'g' and 'h' for 0 and 1.[[Special:Contributions/172.70.162.195|172.70.162.195]] 17:56, 22 February 2025 (UTC)
:Why g and h? I saw an early comment saying the same. Why those when letters are A? --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 18:14, 22 February 2025 (UTC)
::I presume for the "AAAAAAAAAGH!" type thing... (Although, given that a number would then be something like GHHHGGH, as a separate word, I'm not sure it'll look "AAAAAAAGH"ish.
::And is it coded as MSF (42=101010), N-bit (e.g. =00101010), BCD per digit (4=0100 2=0010 =01000010) or some other form? Plenty of scope for interpretation.
::Also, might I suggest E and I (or I and E) for it, instead..? IEIEIE EEIEIEIE EIEEEEIE! [[Special:Contributions/172.68.205.178|172.68.205.178]] 19:10, 22 February 2025 (UTC)

Should "Augh" be added to the versions of screaming? Randall uses it alot, e.g. https://xkcd.com/493/, https://xkcd.com/1401/, https://xkcd.com/1388/, https://xkcd.com/1207/, https://xkcd.com/1226/, https://xkcd.com/780/, https://xkcd.com/990/ {{unsigned|Drkaii|18:06, 22 February 2025}}

ÅĂÃÃÀ ÂȦA̮Ⱥ! A̯ ȀA̦ÀȀÀȺĂ A̰ ÂÀÀẠ A̤ÀẢ AA̦ÀȀÅA̮ ǍA̦ÀĀ 2916 AÀ A̰ÄA̮ÀÄĂ A̱ÅÀ A̓A̰Ä ǍA̯ÄẠ A̓ÅA̰A̦A̰A̓AĂA̦Ⱥ ǍÀA̦ ȀȦÄA̓AȦA̰AA̯ÀÄ A̰ÄẠ ÄȦĀẢĂA̦Ⱥ AÀ A̰ẠẠ A̯ÄAÀ AÅĂ A̓A̯ȀÅĂA̦, A̰ÄẠ A̱ÅA̯AĂ ÅA̰A'Ⱥ ÅA̰A AÀ A̰ÄA̮ÀÄĂ A̱ÅÀ A̓A̰Ä ẠĂA̓A̯ȀÅĂA̦ AÅA̯Ⱥ A̯Ä 1 ĀA̯ÄȦAĂ ẢA̮ ÅA̰ÄẠ. (A̰ẢÂĀ: ĀȂA̦ A A̧ẢA̯A̰ÁȂ ĀA̰AĀ ȦÁA̋ẢÂÃ ȀẢĀA̰ ĀA̰Á ȦĂÄÁ, AÂA̱ A̱ÅÁÃ ẢĀÃ ȀÅȂẠ ȦA̦ A̱ÅẢÂA̋ A ĀȂAÂÃĂAĀẢÅÂ.)
(A̰ẢÂĀ ĀÅ ĀA̰Á A̰ẢÂĀ: ĀA̰Á ȦĂÄÁ A̧ÅÀÁȂÃ 70% ÅA̮ ĀA̰Á ȀÅȂĂA̱'Ã ÃÄȂA̮AA̧Á.) [[Special:Contributions/162.158.90.46|162.158.90.46]] 03:57, 23 February 2025 (UTC)

Can anybody provide pronunciation notes or recordings for those 'A's which are actually used in human languages? Can we transcribe the title text and the "Hello", "Hi" from the comic in IPA or something? [[Special:Contributions/141.101.99.88|141.101.99.88]] 10:33, 23 February 2025 (UTC)

Choose the base letters arbitrarily other than ‘A’ and we get {{w|furigana}}. [[User:物灵|物灵]] ([[User talk:物灵|talk]]) 05:38, 24 February 2025 (UTC)

== Trivia ==

The Trivia "Notes" section reads like pareidolia. -- [[User:Rei|Rei]] ([[User talk:Rei|talk]]) 13:16, 24 February 2025 (UTC)

Talk:3045: AlphaMove

2025-02-02T14:48:37Z

Rei:

Ask Tom Murphy VII to get on this [[Special:Contributions/141.101.99.103|141.101.99.103]] 22:50, 31 January 2025 (UTC)

This has actually been done and tested against other strange algorithms:
https://youtu.be/DpXy041BIlA?t=729

I have attempted to run the proposed bot against itself — if I haven't made any errors, here are the resulting games:

Rounding down:
1. e4 e6 2. f3 f5 3. e5 g5 4. d4 d5 5. exd6 g4 6. d7+ Kf7 7. dxc8=N Ke8 8. fxg4 h6 9. gxf5 Kd7 10. g4 h5 11. fxe6+ Ke8 12. g5 Na6 13. h3 Nc5 14. h4 Ne7 15. Kd2 Ne4+ 16. Ke1 Nf5 17. g6 Nf6 18. g7 Ng3 19. gxf8=N Nge4 20. Ke2 Ng4 21. Kf3 Ngf2 22. Ke2 Nh3 23. Ke3 Nhf2 24. Nb6 Nh3 25. Na4 Nhf2 26. Nac3 Nxc3 27. Kxf2 Nxd1+ 28. Kf3 Qc8 29. c4 Ne3 30. Ke4 Nf5 31. Kd3 Ng3 32. e7 Nxh1 33. Kc2 Qb8 34. d5 Kxe7 35. d6+ Kf6 36. dxc7 Nf2 37. c8=R Ng4 38. Kd2 Nh2 39. Ke3 Ng4+ 40. Kd4 Nh2 41. Kd5 Nxf1 42. Nc3 Nh2 43. Nce2 Ng4 44. Nd4 Nh6 45. Nd7+ Kf7 46. Ndf3 Qd6+ 47. Ke4 Qd2 48. Nf8 Qd5+ 49. Ke3 Qd2+ 50. Ke4 Qd5+ 51. Ke3 Qd2+ 52. Ke4

Rounding up:
1. f3 f5 2. e4 f4 3. d4 e6 4. e5 g6 5. g3 fxg3 6. c3 g2 7. d5 gxf1=Q+ 8. Kxf1 exd5 9. Ke2 d6 10. Kd3 g5 11. Kd2 dxe5 12. Ke2 d4 13. Kd3 dxc3+ 14. Ke3 e4 15. Ne2 exf3 16. Ng1 f2 17. Nxc3 fxg1=N 18. Qc2 Kd7 19. Ne2 h6 20. Qa4+ Ke6 21. Qb3+ Ke7 22. Qb4+ Ke8 23. Qb5+ Kf7 24. Qa6 Kg7 25. Qa4 Kg6 26. Qb3 Kg7 27. Qb4 Kh7 28. Qb5 Kg7 29. Qa6 Nc6 30. Nxg1 Na5 31. Qb6 Kh7 32. Qb3 Kg6 33. Qb4 Kg7 34. Qb6 Kh7 35. Qb3 Kg6 36. Qb4 Kg7 37. Qb6

Rounding down code:
const { Chess } = require("chess.js");

const chess = new Chess();
while (!chess.isGameOver()) {
const moves = chess.moves();
moves.sort((a, b) => b.localeCompare(a));
const move = moves[Math.floor(moves.length / 2)];
chess.move(move);
}
console.log(chess.pgn());

To round up, swap the a and b in the sort function.

Both games end in a threefold repetition draw. The game with rounding down does, in fact, have 6 knights in it, so I believe he did code this to see what would happen.

[[User:Ohpointfive|Ohpointfive]] ([[User talk:Ohpointfive|talk]]) 22:52, 31 January 2025 (UTC)

To elaborate on the Tom VII point - this is the YouTube video that possibly inspired the comic: https://www.youtube.com/watch?v=DpXy041BIlA

[[Special:Contributions/141.101.98.179|141.101.98.179]] 22:55, 31 January 2025 (UTC)
:Specifically, it's the [https://www.youtube.com/watch?v=DpXy041BIlA&t=1483 Arithmetic Player at 24:43] set to ½. [[User:ChaoticNeutralCzech|ChaoticNeutralCzech]] ([[User talk:ChaoticNeutralCzech|talk]]) 17:52, 1 February 2025 (UTC)

Unfortunately for white, it's mate in 1 with Bb4# [[Special:Contributions/162.158.90.124|162.158.90.124]] 23:25, 31 January 2025 (UTC)

Even if white makes a different move, its still forced mate in one. RIP XKCD Bot. [[User:Redacted II|Redacted II]] ([[User talk:Redacted II|talk]]) 00:53, 1 February 2025 (UTC)
:Well, for most options. Queen to a4 puts Black in check, forestalling an immediate move to mate White; capturing the knight de-threatens enough squares around the king that Black can't check next turn without leaving an escape route. [[Special:Contributions/172.70.176.28|172.70.176.28]] 17:45, 1 February 2025 (UTC)

<s>Although it wouldn't change the outcome much (either by changing black's move or white's general options), I'm currently not understanding why Kd4 isn't on the list of options at this point in time. So long since I played serious(ish) chess, and the only reason I could think of is that it's probibited by some strict ortbodox game rule recognising the ''potential'' moving of the knight out of the way (in the next white move-cycle). But I'd have treated that later option as forbidden, as a revealing-mate. But, as I said, it's been a while, so maybe I'm just blind to something like a sweeping bishop-range that disbars this (much as the near knight, bishop and pawn disbars four out of the five moves).</s> ...darn, it's just clicked. That's the AlphaMoved white-knight's destination (before that, the black queen was entirely covering that square, and double-teaming one of the adjacent black-knight covered squares), I'd been thinking that was the piece's origin (with the empty highlighted square as its destination) until I'd finally read the highlighted movelist item properly and deciphered it as Knight To King Two (done), not the (intention of) Knight To King's Bishop One. So ignore the above. Although, just to note, for the Black Queen to have even achieved that position would probably have required at least ''one'' normally-sacrificial exposure to the deadly white Q/B/R pieces guarding the obvious entry, give or take the algorithmic development of their (and the "gateway pawns"') current positions. [[Special:Contributions/141.101.99.104|141.101.99.104]] 02:00, 1 February 2025 (UTC)
:Follow-up... As far as the black queen is concerned, I suppose she could have done d6, (x?)g3 then f2, in-between the other black and white moves made, largely safe from the white 'defence'. Or to d4 then f2, if white Queen's Pawn was shielding still. (Appears to have been taken, but it would have been bold to have done that with the queen, for a normally immediate pawn-queen exhange!) A bolder/more opportunistic set of moves than I would have tried, either. Even (unknowingly) against AlphaMove, I'd have been wary of the unconventionally developing white disposition actually being an idiot-trap (and I'm really not that far off being an idiot, insofar as chess). [[Special:Contributions/172.70.162.162|172.70.162.162]] 02:17, 1 February 2025 (UTC)

The explanation gives both O-O and 0-0 as notations for castling and then explains why 0-0 can never occur, even though O-O can be sorted pretty centrally. So, which is the correct notation? [[Special:Contributions/172.71.250.91|172.71.250.91]] 09:14, 1 February 2025 (UTC)
:According to the [https://ia802908.us.archive.org/26/items/pgn-standard-1994-03-12/PGN_standard_1994-03-12.txt pgn spec], section 8.2.3.3: they are capital Os and not zeros [[Special:Contributions/172.68.3.96|172.68.3.96]] 15:10, 1 February 2025 (UTC)

I'm pretty sure we're looking at a retrograde puzzle. [[User:Ohpointfive|Ohpointfive]] is onto something here, with the six knights on the board a strong indicator. The question is, of course, where is the joke? White plays Alphamove all along and must have started with e4 (rounding down) or f3 (rounding up). Both are consistent with the end position. So from my point of view, the joke is
* either that the "stronger engine" is not a strong engine at all but maybe the same algorithm, rounding up instead of down
* or that black doesn't win this position (in real chess, White is of course toast) because its algorithm is even worse
@Ohpointfive, could you run the two versions against each other? --[[User:Pganon|Pganon]] ([[User talk:Pganon|talk]]) 15:55, 1 February 2025 (UTC)

I created a playable version of this game in like 10 minutes using ChatGPT ;)

https://enn-nafnlaus.github.io/AlphaMove/alphamove.html

Git page here:

https://github.com/enn-nafnlaus/AlphaMove

-- [[User:Rei|Rei]] 17:52, 1 February 2025 (UTC)

I checked, castling and en passant both work. [[Special:Contributions/172.68.245.25|172.68.245.25]] 19:26, 1 February 2025 (UTC)

@Pganon certainly:
White rounding down vs. black rounding up:
1. e4 f5 2. f3 f4 3. d4 e6 4. e5 g6 5. d5 exd5 6. g3 fxg3 7. c4 g2 8. h3 gxf1=Q+ 9. Kd2 Kf7 10. Kc3 Ke8 11. Kc2 Kf7 12. Kb3 Ke8 13. Kc2 Kf7 14. Kb3 Ke8 15. Kc2
White rounding up vs. black rounding down:
1. f3 e6 2. e4 f5 3. e5 g5 4. d4 d5 5. f4 gxf4 6. h3 h5 7. h4 Kd7 8. Kd2 Kc6 9. Kd3 Kb6 10. Ke2 Kb5 11. Ke1+ Kb4 12. Ke2 Kb5 13. Ke1+ Kb4 14. Ke2 Kb5

The first game is quite exciting, with black at one point having a chance at checkmate in one, but alas too many available pawn moves drives the winning move Qxc4# far past the center of the list. The second game is much less exciting.

[[User:Ohpointfive|Ohpointfive]] ([[User talk:Ohpointfive|talk]]) 21:30, 1 February 2025 (UTC)

Here's a question: What is the quickest way to checkmate AlphaMove? Here's the quickest that I have found so far:
# f3 d5
# e4 d5xe4
# f4 e5
# g3 Bg4
# d4 Qxd4
# f5 e3
# f6 Qxd1#
Thus, we have mate in seven. This might be good to mention outside the comments section as a demonstration tha AlphaGo is not very good (not to mention failing to attack black's queen with a less valuable piece), but a quicker checkmate might be possible, in which case we should mention that instead.[[Special:Contributions/172.70.207.159|172.70.207.159]] 11:08, 2 February 2025 (UTC)

: Checkmating Alphamove is easy. Getting checkmated *by* Alphamove is challenging. You basically have to forget everything you know about normal chess. -- [[User:Rei|Rei]] ([[User talk:Rei|talk]]) 14:48, 2 February 2025 (UTC)

2968: University Age

2024-08-06T15:44:00Z

Rei: /* Explanation */

{{comic
| number = 2968
| date = August 5, 2024
| title = University Age
| image = university_age_2x.png
| imagesize = 317x388px
| noexpand = true
| titletext = This only makes it more urgent that we adopt my roadmap for the next 10 years, which should put us solidly in the lead.
}}

==Explanation==
{{incomplete|Created by the HR HEAD OF THE OLDEST UNIVERSITY DESTRUCTION DEPARTMENT - Please change this comment when editing this page. Do NOT delete this tag too soon.}}

[[Cueball]] has been the leader of a university for the last five years. In a speech, he declares that his goal during those five years has been to make his university overtake the age of the oldest university of his state, which was then two years older than his own (215 years vs 213 years old). He declares that he has funded an intensive program to make his university five years older, making it three years older than the other university was when he took the role. Due to the laws of time, this would have happened anyway, whatever he had done, or if he'd done nothing at all (barring his leadership being so catastrophic that the university ceased operating).

The final line of Cueball's speech, "Unfortunately, I have terrible news," presumably precedes the announcement that the rival university has also aged 5 years and is therefore just as far ahead as they were before.

To be fair to Cueball, his plan moving forward might be better than his plan over the previous five years, including discrediting the official starting date of the rival, arguing for an earlier starting date of his university, using Machiavellian tactics to lead to the closure of the rival, etc. Or could be just as impractical as his previous plan, ranging from just waiting (once again), to firing the rival through space at relativistic velocities.

In the title text, the "roadmap for the next 10 years" implies more of the same ineffective efforts, or perhaps strategies to undermine the rival.

==Transcript==
:[Cueball is standing behind a lectern on a stage. He has raised a finger in the air while addressing an unseen audience.]
:Cueball: When I took the helm five years ago, our university was 213 years old – the second oldest in the state, just behind our 215 year old rival.
:Cueball: Under my leadership, we've funded an intensive program to increase our age to 218, overtaking our rival by 3.
:Cueball: Unfortunately, I have terrible news.

{{comic discussion}}

[[Category:Comics featuring Cueball]]
[[Category:Public speaking]]
[[Category:Time]]

2968: University Age

2024-08-06T15:42:42Z

Rei: There are other possibilities.

{{comic
| number = 2968
| date = August 5, 2024
| title = University Age
| image = university_age_2x.png
| imagesize = 317x388px
| noexpand = true
| titletext = This only makes it more urgent that we adopt my roadmap for the next 10 years, which should put us solidly in the lead.
}}

==Explanation==
{{incomplete|Created by the HR HEAD OF THE OLDEST UNIVERSITY DESTRUCTION DEPARTMENT - Please change this comment when editing this page. Do NOT delete this tag too soon.}}

[[Cueball]] has been the leader of a university for the last five years. In a speech, he declares that his goal during those five years has been to make his university overtake the age of the oldest university of his state, which was then two years older than his own (215 years vs 213 years old). He declares that he has funded an intensive program to make his university five years older, making it three years older than the other university was when he took the role. Due to the laws of time, this would have happened anyway, whatever he had done, or if he'd done nothing at all (barring his leadership being so catastrophic that the university ceased operating).

The final line of Cueball's speech, "Unfortunately, I have terrible news," presumably precedes the announcement that the rival university has also aged 5 years and is therefore just as far ahead as they were before.

To be fair to Cueball, his plan moving forward might be better than his plan over the previous five years, including discrediting the official starting date of the rival, arguing for an earlier starting date of his university, using Machiavellian tactics to lead to the closure of the rival, etc. Or could be just as nonsensical as his previous plan, ranging from just waiting (once again), to firing the rival through space at relativistic velocities.

In the title text, the "roadmap for the next 10 years" implies more of the same ineffective efforts, or perhaps strategies to undermine the rival.

==Transcript==
:[Cueball is standing behind a lectern on a stage. He has raised a finger in the air while addressing an unseen audience.]
:Cueball: When I took the helm five years ago, our university was 213 years old – the second oldest in the state, just behind our 215 year old rival.
:Cueball: Under my leadership, we've funded an intensive program to increase our age to 218, overtaking our rival by 3.
:Cueball: Unfortunately, I have terrible news.

{{comic discussion}}

[[Category:Comics featuring Cueball]]
[[Category:Public speaking]]
[[Category:Time]]

Talk:2916: Machine

2024-06-21T22:10:43Z

Rei:

rather late for an april fools comic innit? also there doesn't seem to be anything exciting in this one lol, none of the usual cool exploration easter eggs, as far as i could tell at least [[Special:Contributions/172.71.178.76|172.71.178.76]] 16:41, 6 April 2024 (UTC)Erfaniom
:Randall posted an eclipse comic on Apr. 1. All April Fools comics are interactive. [[User:Z1mp0st0rz|Z1mp0st0rz]] ([[User talk:Z1mp0st0rz|talk]]) 15:27, 10 April 2024 (UTC)

: We're exploring crowdsourced human creativity here, in a way, so it can be a lot more interesting then Randall's exploration comics, at least for me, because i did take two years of GCSE psychology and enjoyed it. [[Special:Contributions/172.64.238.130|172.64.238.130]]

: looks like the egg's on my face lmao, i think i was among the first people to make anything, so everywhere was under construction for me, i didn't even understand that it was like a crowd thing [[Special:Contributions/172.70.210.52|172.70.210.52]] 14:19, 9 April 2024 (UTC)Erfaniom

Just popped over using Chrome on Android and all I see is four "missing picture" logos spinning around, plus another down the bottom right... [[Special:Contributions/141.101.68.193|141.101.68.193]] 18:13, 6 April 2024 (UTC)
:Okay, followup: it behaves quite differently on the non mobile site. You get two entry points with red balls and yellow balls and you need to place the various gizmos to direct the balls to the correct exit point. Once enough have correctly passed to turn the red X into a green tick, you have the option to submit. If you do, once you have named your design it will be added to the grid with other submissions all of which exist to push red and yellow balls around. (if you come across "Memories of Ragnarok", that's mine)
Mine are "Balancing Act" and "100% Success Rate" [[Special:Contributions/172.71.146.14|172.71.146.14]] 21:11, 15 April 2024 (UTC)
[[Special:Contributions/172.71.134.207|172.71.134.207]] 18:27, 6 April 2024 (UTC)
::The number of inputs appears to vary between 1 and 4, each of a different color, with one color-coded output for each. [[User:Claire Kholin|Claire Kholin]] ([[User talk:Claire Kholin|talk]]) 18:49, 6 April 2024 (UTC)

On the "machine" section, you see lots of "under construction cells". Perhaps this will develop as more are submitted. I notice the "under construction tape" has "DJIA" and "31415", perhaps a reference to "dow jones industrial average" and the first five digits of pi. [[User:Zeimusu|Zeimusu]] ([[User talk:Zeimusu|talk]]) 18:37, 6 April 2024 (UTC)
:Whenever someone submits a cell, it fills in one of the under construction cells. [[User:Claire Kholin|Claire Kholin]] ([[User talk:Claire Kholin|talk]]) 18:49, 6 April 2024 (UTC)
[Robert'); DROP TABLE Student!:;--] i just got a machine with 3 outputs one yellow another red and a third blue AND green and 3 inputs one green one blue and one red blue and yellow https://xkcd.com/2916/#xt=7&yt=50 hope its still there {{unsigned ip|172.70.115.173|18:01, 9 April 2024}}
:I think I just 'did' one with a Red+Yellow source (also separate singular Blue and Green) and a combined Blue+Green sink (and separate Yellow and Red). Got it working well, actually using fan-levitation to separate the R+Y enough to route them to their destinations, the Y then having to cross the occasional flying Green (which I was forced to "Bonk" and bounce up, entry being nearly at the bottom on right, exit being nearly at top on left) for its exit, everything else fairly simple. No idea if it got integrated, of course. Never seen any of my machines be accepted (when I later look around at what's there), so I'm still unsure if there's anything I can do to increase my chance of a successful square being made permanent on the grid.... [[Special:Contributions/172.70.163.49|172.70.163.49]] 20:58, 9 April 2024 (UTC)
:...still had it sitting there [https://imgur.com/kZdp3kH on my browser], though note that the Red+Yellow supply (mid-left) and the Green supply (right) aren't working here, through the "move the screen around, lose the feeds from 'Under Construction' squares" issue, or similar. But still I managed to submit it. The occasional Yellow and Red are falling from the Blue entrance in the top (I've not done anything special to filter those out/send them to a more proper exit, and it's too late to do so now anyway, it was just a Blue entry during the development process, of course).
:It's a pity you can't see it working, but I quite like my Yellow/Red separation. This might be the only time you see it in place, though, so a shame I didn't take a screenshot immedediately after submitting it. [[Special:Contributions/172.70.163.49|172.70.163.49]] 21:30, 9 April 2024 (UTC)
:I encountered a puzzle with five distinct pairs of in/out (none combined): Two blue, two red, one yellow. It was difficult! AFAIK five pairs is the highest reported so far. When I submitted the solution to the Machine, it had Under Construction above and to each side, and (IIRC) empty below, and no balls were provided, alas.[[Special:Contributions/172.69.134.216|172.69.134.216]] 03:46, 12 April 2024 (UTC)
I wanted to add an image for each object, but do not have the necessary access, can someone who has access add the images that I linked in the table so they can be included? [[User:Claire Kholin|Claire Kholin]] ([[User talk:Claire Kholin|talk]]) 18:49, 6 April 2024 (UTC)

I found a discussion with some guy talking about the API at https://euphoria.leet.nu/room/xkcd/ ; this could be useful for the wiki.

<code>
[c+1] now time to try fucking with the api
[c+1] https://incredible.xkcd.com/
[userwithnoaccount] 404
[c+1] it seems there are numbered machines under incredible.xkcd.com/machine/x
[c+1] returns a grid of individual machinlets
[c+1] which are uids like 3a7af27c-5389-5dcb-b660-3feab6be2ceb
[c+1] they're stored at urls like incredible.xkcd.com/folio/3a7af27c-5389-5dcb-b660-3feab6be2ceb
[c+1] there appear to be 33 machines total
[c+1] the json it returns seems to refer to these as "versions"
[c+1] $ curl -s https://incredible.xkcd.com/machine/21 | jq ".version"
21
[c+1] there is a machine/0, but it's all null
[c+1] going to https://incredible.xkcd.com/machine/current redirects to the current machine
[c+1] $ curl -sL https://incredible.xkcd.com/machine/current | jq ".version"
35
[c+1] wait, is that the *total* number of mahcines?
[c+1] i would've thought there'd be more
[c+1] this whole think is rather esoteric
[c+1] Written in rust, too: https://rapier.rs/
[c+1] Uh oh.
https://i.hypercone.us/?v=8e283d
[c+1] HMMM
https://i.hypercone.us/?v=079f8f
[c+1] it seems there is no limit
[c+1] i've uploaded a ~50M title
</code>

With this I was able to make a script that visualizes paths of the balls. I was hoping that there would be an interesting pattern somewhere but it appears to be mostly random (https://i.imgur.com/ZvLlucU.png) --[[Special:Contributions/172.71.131.24|172.71.131.24]] 17:12, 12 April 2024 (UTC)

[[Special:Contributions/172.70.57.146|172.70.57.146]]

Had quite a lot of fun, added a few 'successful' machines to the grid. Noted that whenever I try to use the Prism that (after a short delay) the comic-pane blanks and I need to refresh the page/get a completely new 'challenge' to start from scratch, so I'm just not using the prism at all (used most of the other items, in combination or 'just the one across the whole board', whichever seems most fun). But it doesn't seem to do what I'd like it to do, which is sort multiple colours from the same inflow into different outflow directions. Which would be ''very'' useful in a 'crossroads' situation, the general solution of directing them cross-path being too prone to random collisions. Also might be useful in the 'submitted machine grid', as I note that errors propagate, whereas adding a filter on all inputs would clean out (dispose of/send off to a valid gate?) the rogue balls. Anyway, gonna have to come back to this later when there's more time... Maybe then I'll even have something useful to add to the Explanation. [[Special:Contributions/172.70.163.31|172.70.163.31]] 19:03, 6 April 2024 (UTC)

The balls appear to be different weights. I just saw a machine that used fans to separate yellows from greens and blues in a sort of 'wheat from the chaff' manner to direct them to their correct outputs. I wonder what other hidden tricks are included. [[Special:Contributions/172.68.1.159|172.68.1.159]] 19:40, 6 April 2024 (UTC)

They're not all accepted, though it makes you think they are. Or something else more complex is going on we haven't realized yet. I made a machine that was working reliably, submitted it, and saw it on the overall grid. Reloading from a different browser I found the same location of the machine, with the same surroundings, but my machine had been replaced. It's nowhere else on the grid either. The first browser still shows it (but not after a reload with a cache clear). I'm not sure if there's some kind of "save" event that needs to happen beyond seeing your machine in the broader one, or if all user collaboration is an illusion, or if the system changes its mind about us somehow.

: Yeah, i've been seeing this too. Please tell me if you find any of my machines, images at https://i.hypercone.us/?v=22d562 , https://i.hypercone.us/?v=ad8e3a , and https://i.hypercone.us/?v=8d4d6a . I want to be one of the few to have added Catalan and Spanish to the grid. [[Special:Contributions/172.71.134.164|172.71.134.164]] 20:56, 6 April 2024 (UTC)

I've added some more observations to the page. Also, a guess which is too uncertain to put on the main page: The ball launcher for the yellows on the far left side misses a lot, and the yellow container isn't the one on the left. So I think the whole machine with crossing streams will result in the colors being sorted in their container order, and possibly have the streams combined and deposited at the bottom just above the containers. --[[Special:Contributions/172.71.147.100|172.71.147.100]] 21:07, 6 April 2024 (UTC)

has anyone seen the boat at the very bottom? [[User:Mushrooms|Mushrooms]] ([[User talk:Mushrooms|talk]]) 21:21, 6 April 2024 (UTC)

trying to see it on Firefox for Ubuntu and it just tells me to "visit xkcd.com to view" - THAT'S WHERE I AM?! Tried clearing website data (but not my entire cache) and that didn't help. Is there something I'm missing?

Oooh, just had one with four ball-entries (four colours) and ''three'' exits (one caters for two arrows). Pity it's rather complicated to get entries to exits (even if I can merge two of the streams). Might have to give up on it, but I'd like to have seen how it fits in with the 'submited grid'. i.e. someone else gets a two-colour introduction spot. [[Special:Contributions/162.158.74.119|162.158.74.119]] 22:37, 6 April 2024 (UTC)
:Me again. I'm just refreshing the page, looking at the pattern of entries/exits (just a dozen or so screens in, getting some repeats of pattern, indicating that it's going back to tiles it was suggesting before, probably depends on how many others are contributing and extending...)
:Found another 'double-colour' example. Two yellows ''from the same side'', which probably means that there's a two-yellows been asked to exit from the neighbour (will check shortly).
:Quickly adapting from my spreadsheet notation, "R, Y, G, B" in order, each "(Entry, Exit)", I've been using <dir> of L/R/T/B and a number (nominally percentage, though seems to include only values of 20, 30, 50, 70 and 80, so it ''might'' be more 1/6..5/6?) relating to the distance along from L to R (for T/B) or T to B (for L/R).
:This line is therefore (0,0)(L20+L70,R30+B70)(R80,L80)(T70,L50) ... no reds, two yellow pairings, a red pairing, a blue pairing. Would require at least two path-crossings (but I was going to calculate those things later, and double-colours might confuse my intended simple line-intersection calculation).
:...anyway, spent some time on this message, which might mean I'll get into a 'new batch' of available patterns as people have succeeded some of the challenges that I've been 'swiping left'. [[Special:Contributions/172.70.162.20|172.70.162.20]] 19:28, 7 April 2024 (UTC)
:...very next click: (0,0)(T30+L20,R20+R70)(R80,L80)(R50,B50), which is clearly the actual left-neighbour of the above. [[Special:Contributions/172.70.162.19|172.70.162.19]] 19:32, 7 April 2024 (UTC)
:Ok, stopped my refreshing to [https://imgur.com/a/OMFOmzy 'solve' a screen]. First of all I routed both yellows entries (right-upper and upper-right) to one yellow exit (middle-left) and gradually teased the greens across (lower-left to middle-right), as that way I was avoiding a criss-cross of balls, but the the other yellow exit (left-lower) was, of course, invalid.
:Changed it to drop one stream of yellows down towards the lower exit, across the rapidly firing greens (added a fan to filter away the occasional yellow that gets bounced over there, not much of an opportunity to filter falling-greens out of the yellow exit, so apologies to whoever gets the sceen below). Submited as "Two Yellows, One Green!", whether or not that'll save (apparently, I should continue to contribute and not refresh/close, or else the server will not keep the solution?).
:Interestingly, all four adjacent tiles are "Under construction", and if I scroll up... *DARN* the comic has blanked out (nothing there between the upper PREV/RANDOM/NEXT buttons and the lower ones, just whitespace). This may mean that it did not save. This is the kind of 'page crash' I get when I try using a Prism or get too many balls rattling around on top of a Black Hole. Perhaps it doesn't like that I'm scrolling into an Under Construction that shouldn't be there? (But then, why ''is'' it there?)
:Anyway, all extra information for everyone.
:I'll just refresh the page and go back and do some more entry/exit mapping, maybe? [[Special:Contributions/172.70.162.20|172.70.162.20]] 20:17, 7 April 2024 (UTC)

If you combine a bunch of these silly claw things in the middle by just spamming it, it begins to lag and do some chaotic collisions, even without balls colliding on it. It's curious how it does that seemingly randomly though. I wonder how calculations are added and if there's a tiny sprinkle of RNG. (Also, errors occur and say something about damaging recursion in the Rust programming language, so I guess we know how it was made. It's also pretty weird how there's not a lot of opening combinations? It's possible that the machine loops over in chunks of gears or something (that's what I'll call them). ([[User talk:Leo|talk]]) 13:15, 7 April 2024 (UTC)

If you place a black hole in the centre of a wheel, it makes the wheel behave unpredictably between resets. Sometimes it's almost normal, sometimes it's a lot faster than usual, and sometimes it's stopped but launches balls that touch it with extreme force. I was able to use this to submit a machine which didn't actually let a single ball through after being submitted. https://i.hypercone.us/?v=928bcd [[Special:Contributions/162.158.33.149|162.158.33.149]] 01:19, 7 April 2024 (UTC)

The page says that (and I have taken note of) the ball hue is ''coded'' to certain values, but is there a logic to those values that might be derived from the colour (either as RGB triplet or HSV/other colourspace definition). For example, the two ball-types with zero green component in their makeup are 'unit density' (green is far heavier "green+red" is far lighter, so it's not a simple relationship, unless it converts from °hue, in some way) and the only secondary colour exhibits non-zero drag. There's the possibility that it just derived from "we need different properties, we need different colours, we have no reason to connect either with other deliberately" or even some non-mathematical symbology (fire=red, water=blue(?), earth=green, air(/sunlight?)=yellow). But it makes me wonder what combination of properties cyan/magenta balls might have, if added. (Or is the choice of those four colours constrained, anyway? Though R/G colorblindness is already something of an accessibility failure, if anyone suffers that.) [[Special:Contributions/172.69.194.205|172.69.194.205]] 17:02, 7 April 2024 (UTC)
:For color vision issues, on Mac, open System Preferences, select Accessibility, select Display (in the Vision group), select the Color Filters tab, select Enable Color Filters, then finally try the different filters in the Filter Type menu. One of them should help make the colors distinct.[[Special:Contributions/172.69.134.216|172.69.134.216]] 03:40, 12 April 2024 (UTC)

[https://pastebin.com/7PAiLnyF Python script to get the URL and title of each Cell in the current machine]

[https://pastebin.com/xBhywGde Result of running that script at the moment] (encoded with ROT13 because pastebin wouldn't let me save it otherwise)
:has anybody at all whatsoever been able to find their creation using this API? [[User:Bellydrum|Bellydrum]] ([[User talk:Bellydrum|talk]]) 21:58, 7 April 2024 (UTC)

[https://pastebin.com/jN5MP2za Result of running that script on the first 42 machines], at least on these it looks like the only difference is that one cell is added each time? [[Special:Contributions/172.71.99.195|172.71.99.195]] 17:22, 7 April 2024 (UTC)

I've submitted four now, none of which was accepted. I tend to spend a lot of time getting them just right. Any hints as to what the acceptance criteria might be? Or do I just stink at this?
[[Special:Contributions/172.69.59.204|172.69.59.204]] 19:47, 7 April 2024 (UTC)

There appears to be a new object: a cat that bats things that touch it.
[[Special:Contributions/172.69.214.39|172.69.214.39]] 20:17, 7 April 2024 (UTC)

Is anyone else experiencing the bug where prisms cause the comic to disappear (leaving only the white background where it was) after a while? It makes viewing the whole machine basically impossible. (On further testing it appears to be firefox-exclusive.) [[Special:Contributions/172.70.162.38|172.70.162.38]] 20:31, 7 April 2024 (UTC)
:I've had the "Prisms break things" from the beginning (before any practical content). As in, trying to use them in a design breaks things. But I ''did'' glance upon their occasional use in the 'view submissions grid'. Right now I'm suffering from "white only" issue (see my "multi-yellow" accounts, above). I ''am'' using Firefox, if that's indeed relevant to this issue, but right now I'm not near any other up-to-date browser I care to use. [[Special:Contributions/172.70.163.31|172.70.163.31]] 21:37, 7 April 2024 (UTC)
:I'm getting the same issue with black holes (which probably makes more sense - put a black hole there and you'd expect everything else to disappear :o) - except that on one occasion I was able to put about 6 black holes in before the 7th one vanished everything.[[Special:Contributions/172.69.194.121|172.69.194.121]] 09:15, 8 April 2024 (UTC)

Has anyone seen their own cell in the machine at all yet? A manual approval system is probably necessary for obvious reasons, but if so it does seem to be moving quite slowly.
[[Special:Contributions/172.69.65.24|172.69.65.24]] 02:58, 8 April 2024 (UTC)

I've never seen one of my own cells after refreshing the page. :( [[Special:Contributions/172.70.110.122|172.70.110.122]] 20:27, 12 April 2024 (UTC)

How on earth is everyone seeing different parts of the grid? If I request "view machine" I can only see my own square, and the edges of everyone elses. Nothing else, definitely not all of the machine. [[Special:Contributions/172.68.64.149|172.68.64.149]] 21:11, 8 April 2024 (UTC)
::You should be able to click and drag the view around. [[Special:Contributions/172.71.242.54|172.71.242.54]] 21:41, 8 April 2024 (UTC)

Whoever designed the room entirely full of fans is evil - every time I scroll near it my entire browser freezes up and becomes unresponsive. And then the comic usually blanks.[[;8Special:Contributions/172.69.194.81|172.69.194.81]] 08:23, 9 April 2024 (UTC)

None of [https://www.explainxkcd.com/wiki/index.php?title=2916:_Machine&diff=339487&oldid=339486 these edits] were anything to do with "grammar", so why would anyone describe the change as such? The spelling of "colo(u)r" is an internationali[s|z]ation issue, of note, and why I usually prefer to defer to using words like "hue", instead, in such contexts on this site. The change of the link from "The Incredible Machine" (where the page exists) to "The Credible Machine" (where it doesn't, because that's really just this comic's own joke) I aready changed back... If you think it doesn't properly explain the pun/negation, then rewrite; but don't make it an invalid link to something that doesn't even exist, as you'd know if you had even followed the link(s). [[Special:Contributions/172.69.194.141|172.69.194.141]] 15:22, 12 April 2024 (UTC)

Folks might be interested in my list of all published blueprints with their titles and permalinks: https://github.com/scpso/incrediblexkcd. scpso [[Special:Contributions/172.68.144.147|172.68.144.147]] 13:18, 14 April 2024 (UTC)

== Level scrolling bug ==

When one views the whole machine, and scrolls down far enough, everything just disappears, and the comic is completely unresponsive. Has anyone else seen this? [[Special:Contributions/198.41.236.152|198.41.236.152]] 20:38, 7 April 2024 (UTC)

:I'm now seeing the same issue, I wasn't before. (I'm using Chrome) [[Special:Contributions/172.70.162.20|172.70.162.20]] 21:06, 7 April 2024 (UTC)

::A hard refresh appears to have fixed this for me (same person as above). [[Special:Contributions/141.101.99.101|141.101.99.101]] 10:28, 8 April 2024 (UTC)

:I've been having this issue as well (I'm using firefox). Opening the site in Edge instead seemed to work around it for me, so it might only affect Firefox (and derivatives). [[Special:Contributions/172.70.163.31|172.70.163.31]] 21:27, 7 April 2024 (UTC)
::See also the 'firefox bug' comments currently immediately above this section. (Please don't ask me to start Edge up, I hate it, won't use it any more than the system requires me to...) [[Special:Contributions/172.70.163.31|172.70.163.31]] 21:37, 7 April 2024 (UTC)

:Update - I did a hard refresh so I could play around with the new additions and I'm no longer encountering the bug, even on firefox. I think the "white screen" bug is fixed now and you just need to hard-refresh to download the fixed JS instead of using the cached one. (same person as 172.70.163.31 and 172.70.162.38) [[Special:Contributions/172.70.86.16|172.70.86.16]] 11:16, 8 April 2024 (UTC)

==New Category: Ball Pit?==

What do you think about a new category for comics with [[ball pits]]? [[150]], [[219]], [[485]], [[498]], [[2916]]? [[Special:Contributions/162.158.134.229|162.158.134.229]] 21:50, 7 April 2024 (UTC)

[[:Category:Playpen balls]] already exists.
[[Special:Contributions/172.70.174.133|172.70.174.133]] 17:35, 9 April 2024 (UTC)

== Prism Use? ==

Can the prism be used to sort balls by color? (or in any other way that is useful and different?) [[Special:Contributions/172.68.34.61|172.68.34.61]] 12:11, 8 April 2024 (UTC)
:From what I've seen, no. Though may be ''extremely'' susceptible to incident angle. As far as my own use has been, they seem to randomise the trajectory (possibly also do a total-internal-reflection, I've had balls bounce around and exit at ''really'' weird angles), but it's hard to collimate a feed of balls into a single exact track, even straight down from a ceiling-feed (if you have a ceiling feed directly over the floor exit, lucky you, it'll still occasionally perturb balls off to the sides just enough to be bounced out as a gate-miss, unless you add 'funnel' architecture of one kind or another). Oh, and when balls do a lot of 'internal bouncing' it often forced me to reload the comic (overloaded the physics engine?), so could not continue to tweak the same design.
:On the other hand, perhaps this was the ''intent'', and just code/browser failings made it work erratically. Maybe would be an idea to go back and retest for this (anybody who can), do a little !!science!! to be recorded and explained on the page. [[Special:Contributions/172.69.43.183|172.69.43.183]] 12:51, 8 April 2024 (UTC)
:So, ive did some testing and found..nothing. i ''did'' find some uses for the prism though. Like outting them diagonally makes the balls follow a "path", speeding up more and more (not really that great but it works with yellows), and that any ball hitting the left edge will try to go the the right edge. Not sure what else it can do, though. [[User:Begocc|Begocc]] ([[User talk:Begocc|talk]]) 09:35, 10 April 2024 (UTC)
::I did some thorough testing on a combined Red/Blue set of balls (carefully managed so that they were dropping into the target area as similarly as possible) and both rotated and moved the prism in various ways to check for any effects - like needing to enter parallel/perpendicular to the colour-bands, either to land on the 'target band' or start to pass across it, with the band then either facilitating or angling its 'fall through'. (Just visually checked, at first, then later adding 'buckets' below and to the sides, to try to catch balls departing on various trajectories in various 'clumps' making note of any that hit the 'bucket'-boundaries and bounced off elsewhere.)
::I found no significant sorting, and some balls would jitter around so much (within the prism) that they even launched almost straight back up where they came from (less poerfully than a Bonk-buffered ball, but not far off - also not reliable enough to use as a ball-elevator).
::In my experience, Yellow-sorting is easy (even against Blue and/or Red) by other means. Green is the easiest to have everything else sorted ''from'' (because it resists the fan method). The hardest to unmix are Reds from Blues, which one might think ''should'' be the most prism-differentiated but I'm afraid I just can't invoke that. Easier to have them fall a long way then bounce off a suitable bit of 'furniture', I can then get them to distribute ''fairly'' distinctly in two handy recepticles/onward-feed-hoppers, though it does need some careful placement of items to do it justice. It appears that none of my designs have made it to the 'public wall', but I have made a submitable machine or two that does such sorting sufficiently successfully to send it out (theoretically) to be seen. [[Special:Contributions/172.70.163.30|172.70.163.30]] 11:38, 10 April 2024 (UTC)

== Bugs and Exploits ==

You can use a sword to break the physics on the hinge thingy and create your very own "magnetic hill": https://imgur.com/a/IRZ0AlL [[Special:Contributions/162.158.134.108|162.158.134.108]] 13:02, 8 April 2024 (UTC)
:Hard to tell from that what other fans (perhaps) you've got completely off-clip.
:Those hinge-thingies can definitely be shifted by horizontal (outwith ball-weight pressures), but I've not found them to be reliable components as the "Stop" button (ball reset) seems to let those 'hinges' slring back to level, which might need a re-reset by moving them back past the thing that's holding them off-level.
:I have tried a few things with them:
:*'Ticker' mechanism, almost like a clock escapement, nudged by the rotating 'waterwheel', perhaps to try to release balls through a stream of other balls whilst keeping the path clear of collisions for each set, in turn.
:*'Batch dumper', accumulating a number of balls (above the 'hinge', behind a vertical bulkhead) until there's weight enough to 'open the hatch' and roll them out. (Again, an attempt to reduce collisions, by clumping batches together).
:*Finely configured inclines, by shoving something up into a free end of hinge with better angular resolution (but, as mentioned, this doesn't seem to want to 'hold', so probably would fail upon submission).
:...I had wondered if there was supposed to be a "falling anvil creates a catapult/ballista" idea behind the piece, but we don't ''have'' falling anvils (and definitely not in a repeating manner), and ball-powered catapult (esssentially "clown/acrobat jumps on one end of seesaw, clown/acrobat on other end flies up into the air") also doesn't seem practical.
:I'll try to recreate ''your'' design, work out if there's anything new about it, but right now looks like it's a fan-powered incline-raiser. [[Special:Contributions/172.70.162.38|172.70.162.38]] 14:23, 8 April 2024 (UTC)
:: No fans! Here's a wider view: https://imgur.com/a/xPJcsor
:: It survives the reset, because the balls falling on the lever push it down to the sword and it gets stuck there every time. But you need to place the sword just right to make the gravity bug happen. And even then it depends on the number of balls in some ways. [[Special:Contributions/172.68.243.27|172.68.243.27]] 14:46, 8 April 2024 (UTC)
::: I've replicated the "tip of sword grabs the 'hinge'" thing, which is very interesting, but not the anti-gravity effect. The movement still seems ''to me'' more like a fan's 'area of effect' thing, than a wonky sense of gravity, the way that the balls are rolling/resisting/interacting with each other. No, I can't see where you've 'hidden' the fan (and I'm sure that fans can't act across submission-grid-boundaries, which was my next guess), so it's a bit of a funny thing that you've got there. [[Special:Contributions/172.70.163.49|172.70.163.49]] 21:35, 9 April 2024 (UTC)

On occasion, two balls will fall from the containers as a pair, as if glued together. When this happens, they float down as if under much lower gravity, and then suddenly explode violently away from each other.[[Special:Contributions/172.69.43.182|172.69.43.182]] 10:56, 10 April 2024 (UTC)
:What contaniners?? [[Special:Contributions/172.70.110.252|172.70.110.252]] 14:58, 12 April 2024 (UTC)
::At the bottom of the grid are four containers that the balls are fired in to, from where they drop in to a pit with a boat.[[Special:Contributions/172.70.162.38|172.70.162.38]] 08:40, 15 April 2024 (UTC)

When the browser is running slowly, sometimes the chamber doors will open, but none of the balls in them will drop, which can lead to huge backlogs of balls building up. However, there appears to then be a limit to how many will dispense in one opening - only half a dozen or so layers are released before the door closes again.[[Special:Contributions/172.70.163.31|172.70.163.31]] 12:01, 24 April 2024 (UTC)

== The USS Buoyancy ==

Guys. The Buoyancy. She ''floats''. When all four sets of balls reach the ball pit there aren't further additions. The boat starts floating on them. I've been watching it for a while. It seems she moves left and will probably end up escaping the ball pit. [[User:DL Draco Rex|DL Draco Rex]] ([[User talk:DL Draco Rex|talk]]) 20:44, 8 April 2024 (UTC)
:Update: A new row spawned in and it reset just before the Buoyancy could escape. Here's a screenshot I grabbed a while before the reset, she'd moved further left by the time the reset occurred. https://imgur.com/gallery/8UCASCu [[User:DL Draco Rex|DL Draco Rex]] ([[User talk:DL Draco Rex|talk]]) 20:51, 8 April 2024 (UTC)

Alright, I'm almost 100% of the time seeing Buoyancy sink. Yes, she *floats* at first. But as she drifts to the sides, instead of yellows going underneath, reds and greens pile on top. Then, as the balls under expire (90 second timeout), she will start to sink. Very consistent behavior over time.
[[User:Keybounce|Keybounce]] ([[User talk:Keybounce|talk]]) 19:20, 11 April 2024 (UTC)

What is the Bouaancy i cant find it anywhere??? [[Special:Contributions/172.70.110.252|172.70.110.252]] 14:58, 12 April 2024 (UTC)
== Added key combinations, found in source ==

ctrl+alt+b
ctrl+shift+option+d
wheel: arrow keys

: Can you clarify what "option" is? I have tried alt, function, and "operating system", and none are doing it.
::It is alt [[Special:Contributions/172.70.110.252|172.70.110.252]] 14:58, 12 April 2024 (UTC)

== Fixed Number of Possible Machinelets? ==

I was resetting my browser to try and find new machinelet configurations, but there seem to be fewer and fewer as the game progresses. Hypothesis: the 'under construction' machinelets are set, and once one of them gets approved and added to the grid, that specific configuration of entrances/exits can't show up again.

== Advanced components? ==

How does one get access to the full set of components to build from? I'm only given planks, mallets, swords, scoops, anvils, bricks and fans. I never get any pillows, bumpers, cats, stick figures et cetera. Do they need to be "unlocked" through some achievement, or what? [[Special:Contributions/162.158.222.102|162.158.222.102]] 11:04, 9 April 2024 (UTC)

:This caught me for a while as well. I have since discovered that the tool box has a scroll bar and can be scrolled down; that's where the others are hiding.
::Invisible scrollbars – every GUI obfuscator's favorite tool for making users' lives harder. [[Special:Contributions/162.158.222.142|162.158.222.142]] 18:17, 9 April 2024 (UTC)

== Limit of 100 components? ==

Has anyone else seen this? At some point I started getting a count "95 / 100" towards the bottom of the toolbar. When it hits "100 / 100" the rest of the toolbar greys out, and I can't add anything more. (I suppose the physics engine has to keep a ceiling on the number of possible interactions between components.) —[[User:Scs|Scs]] ([[User talk:Scs|talk]]) 11:53, 10 April 2024 (UTC)
:Yes, quite early on I was dealing with a quite simple 'drop from ceiling straight down to floor' setup. After adding just enough 'funnel' to deal with 'splatter', I then built a castle wall in the open space just to make it fun (with some figures on/below it, that I've also tried to decorate in later submissions), of the 'grey blocks'.
:I actually hit the 100/100 ''exactly'' as I placed my final intended block. (No doubt that it's easy to hit the limit by just overlapping things so you can't see most of them, and other 'useless' placement, too...) [[Special:Contributions/172.70.85.48|172.70.85.48]] 19:57, 10 April 2024 (UTC)

== uss boyancy ==

Why have i not been seeing any uss boyancy [[Special:Contributions/172.70.110.122|172.70.110.122]] 14:04, 10 April 2024 (UTC)

Haha I dare you to go to https://xkcd.com/2916/#xt=7&yt=57 and stare at the two black holes next to eachother >:) [[User:Z1mp0st0rz|Z1mp0st0rz]] ([[User talk:Z1mp0st0rz|talk]]) 15:27, 10 April 2024 (UTC)

== Build a "working" machine from parts? ==

Has anyone started working on this idea:

Since any given machine segment seems to be saved, even if not in the final result, *and* since these segments are failing when combined in the whole, how about a "really working" machine that starts replacing failing segments when they jam or otherwise fail to work in the real machine?

The idea being something like, start the machine. Watch the top row, and see where the parts are failing to pass balls properly after two minutes. Replace the segments that are failing/jaming/etc, and let the new part process balls.

As you work your way down, over about 2 hours at the current size, you will eventually get a machine that properly sends balls down to the bottom, without jamming, without having to "pretend" that off-screen parts are working.

I mean, it's not like a gigantic, 600 segment machine will overflow memory on modern 32gb systems, nor consume so much power that these big huge CPU's will fail, right?
There is a 100 piece limit sadly
[[User:Keybounce|Keybounce]] ([[User talk:Keybounce|talk]]) 17:41, 10 April 2024 (UTC)
ps.: Why do white holes, black holes, prisms, etc, cause problems on some machines like mine and not others?

== Foreshadowing ==

I think that this Machine comic / game is foreshadowed by comic # 2785 titled Marble Run. {{unsigned ip|172.70.130.120|22:15, 11 April 2024}}

== Implementation? ==

Should we have a section on how this thing is implemented? How much is known? Obviously it's hugely dependent on [https://rapier.rs/ Rapier], as credited in the header text. I assume everything else is written in {{w|Rust (programming language)|Rust}}, too. But how is it deployed? Does Rust compile to {{w|Web Assembly}}, or what? Under Color Routing, our explanation mentions that the ball "values were extracted from the code" — how much of the code is actually visible? —[[User:Scs|Scs]] ([[User talk:Scs|talk]]) 16:39, 12 April 2024 (UTC)
:There are source maps available for the client side. So most of the client source is pretty much there an available. DevTools will load these maps automatically by default, and you can find the ball parameters under incredible/src/components/widgets/Balls.tsx. As for the server, it has a Server header of Warp/3.3.31, a web server used for WAI applications in Haskell. [[Special:Contributions/172.70.114.44|172.70.114.44]] 13:37, 14 April 2024 (UTC)
::The source is available at https://github.com/xkcd/incredible --[[Special:Contributions/172.68.253.130|172.68.253.130]] 17:58, 17 May 2024 (UTC)

== XKCD Prize ==

I propose the award of "Good Job" trophies for answers to the following weighty questions:

Cells ...

:C1. There is always at least one entry-exit (same color) pair. I have seen up to five pairs. Is there a limit?

:C2. I have never seen a two-color entry or exit, in over 100 tries, but I have seen pictures posted of this case. How rare are they?

Entry points (where balls enter the cell) ...

:E1. The entry rate varies randomly. Is there a limit to the range of time between two balls?

:E2. Some entries produce balls much faster than others, forever. Does this depend on color? Location? Anything else?

Exit points (where balls leave the cell) ...

:X1. At exits there is a display indicating x or check, and a ring meter showing progress towards check. Eating the wrong color reduces the ring score. By how much? Is it the same amount as is gained by eating the correct color?

:X2. The ring countdown starts about 4 seconds after the last ball, and lasts about 10 seconds. Does this ever vary?

Object properties ...

:O1. The pillow clearly absorbs energy. What other objects have variation in bounce, and how much? By sending a stream of green balls at high speed into targets, it can be observed that the brick and the shot glass (outside edge) are more bouncy than the anvil, which in turn is more bouncy than the plank. Are other colors (such as red) affected the same way?

:O2. Does the bounciness of any objects vary over their shape? The head of the mallet seems a little bouncier, but it's hard to set its angle to precisely match other test objects. The shaft of the pivot thing seems to be sticky. The dead edges of the triangle bonkers seem to absorb all inward energy from green balls, but only some energy from red balls.

:O3. Do the bonkers give a constant exit speed, or does it depend on something like the arrival speed or ball color? Does the exit speed replace the entry speed, or are they combined somehow? Like the dead edges (see O2) I suspect the live edge also absorbs inbound energy before it fires, so the outbound energy may be constant, though maybe not for all colors.

Cats ...

:K1. Over what range and direction will the cat swat at a nearby ball?

:K2. Does the cat always add the same amount of energy when swatting a ball?

:K3. Does the cat always add energy in the same direction when swatting a ball? At first glance the direction seems to be random over a range of angles, but this may be due to random entry points, speeds, and directions for the balls, rather than due to randomness by the cat.

:K4. Is there a rate limit for how often the cat will act?

Black holes and Repulsers ...

:B1. At their default size, repulsers are much stronger than black holes. How much stronger?

:B2. How does effect scale with distance? Are black holes inverse-square? What about repulsers?

:B3. Is there frame dragging around black holes? (good luck :)

:B4. At an exit, does the rate of ring decay slow down if a black hole is nearby?

Bonus observation: Black holes have large solid centers. A red ball stuck to a black hole can be seen bouncing off the center.

Spoiler for B1 and part of B2: If five default size black holes and one default size repulser are all placed at the default center, they seem to cancel out exactly, at all distances, though the solid centers still repel direct collisions. So the ratio is 5:1 and the distance equation (whatever it is) seems to be the same for both objects.
[[Special:Contributions/162.158.167.94|162.158.167.94]] 15:53, 14 April 2024 (UTC)

: C1: Current (as of y=70 filled) maximum across the machine is 5 pairs, only occuring 5 times, so I suppose it doesn't go higher. C2: So far there are only three combined gates in the machine, all two-color: one between (3, 8) and (4, 8) and two between (6, 50) and (7, 50). So yes, they are very rare. [[Special:Contributions/172.70.250.206|172.70.250.206]] 21:38, 14 April 2024 (UTC)

:Re. X1, I'm pretty sure (but don't have evidence, that the answer is 'no - a bad ball reduces it by more than a good ball increases it'. I can also think of an X3 - Does a good ball always increase the counter by the same amount; does this vary by colour or anything else? [[Special:Contributions/172.69.195.229|172.69.195.229]] 08:47, 15 April 2024 (UTC)

: E1: In the machine there is a value called ms_per_ball. Its value is 1000. Ie, a ball should be spawned every 1 second into the overall machine per entry. [[Special:Contributions/162.158.111.212|162.158.111.212]] 18:56, 15 April 2024 (UTC)
:: Measuring five random new puzzles, I found most entries deliver 1 ball per second, or almost that much. But I found one green entry that only provided 1 ball every 2 seconds (15 in 30, forever). When I delivered those green balls to the green exit point, I found the ring meter there filled up twice as much per ball consumed. Later I found a red entry that produced only 8 balls in 30 seconds, forever. Those red balls also filled the red exit ring meter much faster than usual. [[Special:Contributions/172.69.134.17|172.69.134.17]] 12:51, 8 May 2024 (UTC)
: K1: There are 3 collision zones defined for the cat swat: The head, its butt & a zone in front of it ("swat sensor"). [[Special:Contributions/162.158.111.212|162.158.111.212]] 18:56, 15 April 2024 (UTC)
: K2: Yes. There is in fact a hidden property called catMass. Its value is 2. I am not aware of any machines which submitted a different value. I have submitted my own (sadly not accepted) with stronger cats (a higher catMass value). [https://incredible.xkcd.com/folio/02092fc5-9e23-5468-990e-fba7d67d82c6 Here's an example]. This value is multiplied by 8 and then divided by the minimum of inverse mass of the ball or JS' Number.MIN_VALUE. So to answer your question: yes, it is the same, unless this value got altered (through external methods) and depending on the ball type. [[Special:Contributions/162.158.111.212|162.158.111.212]] 18:56, 15 April 2024 (UTC)
::I observe the cat imparts the same velocity to yellow balls and to green balls. The green balls weigh about 30x more than the yellow balls, so I think for "same energy" the answer appears to be no.[[Special:Contributions/162.158.167.28|162.158.167.28]] 15:29, 24 April 2024 (UTC)
: K4: A cat will at the fastest swat every 200 ms. However up to another 400 ms are added by random. So the limit is a range from 200 to 600 ms. (Simplified, there is a period called "baby jail" where the cat has stopped the 'swat' animation but still cannot swat a new ball. This time is included in the previous calculation.) [[Special:Contributions/162.158.111.212|162.158.111.212]] 18:56, 15 April 2024 (UTC)
: C2: After trying well over 200 reloads, I obtained a cell with three entries (inputs) and four exits. One of the entries produces both blue and red balls, at different rates. [[Special:Contributions/172.69.134.17|172.69.134.17]] 12:47, 8 May 2024 (UTC)
: E1, E2, X1, X2 and X3: The example link posted above regarding K2 is very enlightening. It reveals (in JSON) that entries and exits have assigned speeds called "rate"s (partly addressing E1, E2, X1, X2 and X3). Rates range from at least 0.55 to 0.76 (maybe balls-per-second, and maybe up to 1.0). It also reveals the items we add are "widgets" and they each have names such as "board" and "catswat". Also the entries and exits are called "inputs" and "outputs", and the balls have types including 1 and 2 which probably correspond to colors. Further review of such examples could be used to update and harmonize the main explanation. [[Special:Contributions/172.69.134.16|172.69.134.16]] 12:53, 8 May 2024 (UTC)

== Submission Rules ==

Has anyone had any luck determining what the rules for submission are? Like many others, I've submitted a few that I've taken painstaking care to get right only to have them disappear after the refresh, never to be seen again. At first I assumed it was first come, first served, with the first submission getting included, but I'm not so sure.

I took a look at the "[https://pastebin.com/jN5MP2za first 42]" versions that someone provided above, and noticed:
* The very first submission, "Pretty Bad" at (0,0) is still there.
* The second submission is "Don't Forget to Switch Your Fans" which is actually (7,0). It's also still there.
* These are followed by "sword" at (2,0) and "Fred" at (1,0), also still there.
* Next is "Pinball Bouncer" which is actually (0,1).
* Next is "undercomplicated". However this is then replaced by "OnlyFans" which is then replaced by "popcorn". "popcorn" appears at (3,0) and is still there.

What caused these to be added, then removed/replaced if it's first come, first served?

I also noticed over the weekend that I was getting assigned blocks that weren't even in the machine yet. I had rows 67 and 68, and the machine was only on row 65.

Also, I did two on row 68, then one on row 67.

None of these got added, which I assume means that someone else completed them before me, BUT that I started before they finished, otherwise I would hope I wouldn't have been assigned one that was already done.

Just now, I created one for a simple red-in, red-out at (7,73). I completed and submitted it. Then I refreshed and hit the edit button a few times and after a few tries I got another red-in, red-out with the input and output at the exact same place. I threw a couple of boards into it and submitted it and it showed it at the exact same spot, (7,73). So I was able to create a new one for the same spot I had already submitted one. I feel like this implied it's not first come, first served, as if so, why would it allow more people to submit for the same spot that someone had already successfully submitted? FWIW, the lowest row on the actual machine at this point is 70. [[Special:Contributions/172.70.134.54|172.70.134.54]] 15:16, 15 April 2024 (UTC)
:: The criteria is not known yet. But it seems you are supposed to be able to make multiple submissions per specific cell / puzzle type (there is a list of puzzles sent to the client, when you submit one, the server picks a position which fits that puzzle.). Then one seems to be chosen manually for a specific cell. There are times of day when the machine is being updated very often, and other times when nothing happens for a while, indicating it is likely a manual process. When a puzzle is added to the grid, the value `snapshot` is populated under its corresponding /folio/ URL. Otherwise it is null. The submission time does not seem to have an effect on if your machine would be accepted. [[Special:Contributions/172.68.195.183|172.68.195.183]] 18:29, 15 April 2024 (UTC)
:It's not simply the first submission, because then we'd see many more simple solutions. Most of the trivial cells get artistic designs and overcomplicated contraptions, which take longer to build and would have lost to simpler and quicker solutions. It's not always the most elaborate contraption, because there are a few really minimal solutions where surely someone else submitted something more complex. It's often not the most correct solution, because many designs get clogged quickly or lose many balls, and I've seen some good solutions get replaced with ones that mis-sort many more balls. It's not always a bad solution either, because there are some that work really well.
:It's possible that the server collects submissions for a while and then chooses one at random. It's also possible that the selection is manual, or maybe the manual step is just a final approval to ensure that no hate speech or other garbage gets in.

man I love messing with the hinges lol [[Special:Contributions/172.70.54.165|172.70.54.165]] 18:49, 18 April 2024 (UTC)Maxalon

==Is the Machine now 'complete'?==

For the first time, I'm seeing a machine with no 'under construction' cells. Do we think it has now stopped processing new submissions (despite still having the option to build them)? [NB - even with all the bottom row cells providing balls to the chambers, the Bouyancy is still only reaching the side of the pit and then sinking.][[Special:Contributions/172.70.91.146|172.70.91.146]] 11:57, 24 April 2024 (UTC)
:On the contrary, here. I submitted some machines. (Even did a hard-reload of the page, between them, in case I had to 'update' the scripting behind it.) I get my solution placed at the bottom layer (in once case, it had a "chuck across to the ball-bins" pipe, though nothing got sent across to the ball-bin/no activity was happening in the ball-pit and there's no USS Bouyancy floating around, in another, it just went into nothing) but I'm ''surrounded'' (to the sides, and above) with Under Construction Tape machine-cells. In one example, I had to scroll up 19 layers before I hit any actual machines (in another, it was well into the 20s, but I lost count).
:Latest submission was [https://xkcd.com/2916/#xt=9&yt=65&v=896 this one], didn't keep a note of the immediately prior ones. Not sure what it looks like from anybody else's perspective. (Nor [https://xkcd.com/2916/#xt=9&yt=66&v=896 a] [https://xkcd.com/2916/#xt=8&yt=69&v=896 selection] [https://xkcd.com/2916/#xt=10&yt=67&v=896 of] [https://xkcd.com/2916/#xt=1&yt=72&v=896 those] [https://xkcd.com/2916/#xt=1&yt=71&v=896 that] [https://xkcd.com/2916/#xt=5&yt=69&v=896 I] [https://xkcd.com/2916/#xt=1&yt=72&v=896 noted] previously... And given that there are two "xt=1&yt=72"s in that list, it looks like I later 'redid' a cell anyway, presuming the "v=896" is my constant UID, as it has never changed since I started to note these things.) [[Special:Contributions/172.69.79.139|172.69.79.139]] 23:30, 25 April 2024 (UTC)
:Postscript: "[https://xkcd.com/2916/#xt=9&yt=65&v=896 this one]" doesn't even send ''me'' to my own just done machine, when I test it! In fact, I'm fairly sure that the one I was linking had green and red (maybe red) balls that needed 'servicing', not the Blue/Red of the "LBC" cell. If not that, it was green, red and blue, but I think that was the one before the hard-refresh. [[Special:Contributions/162.158.33.145|162.158.33.145]] 23:36, 25 April 2024 (UTC)

:Definitely still under construction - it's up to version 1233 as of now. I've been keeping an eye on it - you can see a list of all published machines with permalinks on my [https://github.com/scpso/incrediblexkcd github page] and search for the names of machines you've submitted to see if they ever got published, or download the csv if you want. None of mine have been published but I've still had a lot of fun. [[Special:Contributions/172.68.144.154|172.68.144.154]] 13:27, 27 April 2024 (UTC)

:As of May 23 2024 it looks complete - no "under construction" cells (except during page load). I also notice that the new blank machines on offer for solving have become simpler. Most have only one or two pairs of inputs/outputs now; rarely three. When the page was new it was possible to get four or even five pairs. BTW many of the submissions are very clever, so congrats to those who were chosen. [[Special:Contributions/172.71.158.116|172.71.158.116]] 20:03, 23 May 2024 (UTC)
::Nope, it's still going. [[Special:Contributions/172.69.59.204|172.69.59.204]] 23:35, 26 May 2024 (UTC)
::Maybe the reduction in input/output counts is intentional, to assist in fitting accepted submissions into the machine. [[Special:Contributions/172.69.22.56|172.69.22.56]] 14:44, 27 May 2024 (UTC)
:::I believe it might be complete now. I just submitted one and it replaced one of the existing cells not near the end of the machine. There are no "under construction" cells. [[User:InTheSky|InTheSky]] ([[User talk:InTheSky|talk]]) 09:09, 28 May 2024 (UTC)
::::Just yesterday, I had "construction all the way round" my submission (well, left, right, I was not on the bottom layer and the cell above had yellow tape; did not scroll to see diagonals/further), but I can't test the situation ''right now'', so it might have changed. But I am so used to entries being within a mass of 'taped off' neighbours (and not yet, SFAIK, had a permanent entry into the recurring composite 'board' that lasted beyond the period of submission). [[Special:Contributions/172.70.162.18|172.70.162.18]] 10:09, 28 May 2024 (UTC)

:Getting the machine layout in a JSON form (see above) always revealed a sructure with 128 rows, gradually filling up from version to version. I assume the complete version would have 128 rows filled. --[[Special:Contributions/172.70.246.187|172.70.246.187]] 07:54, 4 June 2024 (UTC)
:: Guess you were right, you can no longer play the game, just see the grid. Which is sad. I would still like to play if I had an idea, even without submitting [[Special:Contributions/172.70.162.185|172.70.162.185]] 00:31, 11 June 2024 (UTC)
:::You can still play the game; a bunch of new layouts just got added, including a 5i5o and 3i4o. But it does look like new rows are no longer being added, just put on top of existing ones.[[Special:Contributions/172.69.22.56|172.69.22.56]] 06:20, 13 June 2024 (UTC)

== Balls have spin ==

This is subtle, and hard to see because the balls no visible texture: The balls carry spin. It can be seen, with effort, using green balls (which are heaviest). Rolling down a slope (say, two boards), green balls accumulate spin in the direction they are rolling. Let them drop off the end and then bounce off a brick such that they travel upward, but with very little sideways motion. Then "catch" the balls with a brick just past their apex, when they are moving slowly. If the ball lands on a horizontal brick, it can be seen that the ball will suddenly accelerate left or right based on the spin. [[Special:Contributions/172.71.155.18|172.71.155.18]] 15:17, 1 May 2024 (UTC)
:I will add this to the explanation.[[User:PDesbeginner|PDesbeginner]] ([[User talk:PDesbeginner|talk]]) 03:05, 19 June 2024 (UTC)

== Stacking Objects ==

Stacking certain objects seems to stack their effects. For instance, enough Fans placed directly on top of each other are strong enough to redirect even green balls in mid-flight.

Multiple Bonks create a more powerful bounce, sometimes fast enough to make the ball seem to disappear briefly. These effects can be useful in overcoming certain restrictions and difficulties, or just for the joy of watching balls rocket around.

Stacking moving objects like Hinged Hooks and Wheels creates a completely different effect. Multiple hooks of either handedness - left or right - will lock together and then start to rotate slowly or swing wildly, together or separately, in both directions. Even when the hooks are moving slowly, balls that interact with them will sometime either rocket away or stick to them with a gravitation effect.

Combining left and right hooks has similar effects, but more than 4-6 of either hook will typically slow the animation, and eventually freeze it completely.

More Wheels can be stacked than hooks, with numbers in the dozens still allowing the animation to proceed. They will act in a similar fashion, sometimes locking and sometimes spinning wildly. Balls that strike them will be projected away at high speed, sometimes disappearing, or reappearing in a different section (a round Bonk will often flash briefly with no visible interaction).

Other interaction include sucking the ball into the interior of the wheel, where it sometimes disappears, or clinging to the surface like a gravitational attraction. The more Wheels, the more likely that the ball will simply disappear.

These techniques create interesting chaotic environments in the cell, but make it difficult to meet the ball feed requirements for submission. With multiple inputs it becomes effectively impossible. One work around is to separate streams for the balls at the source, protecting one stream to feed it into the output while allowing the rest to interact with the chaotic object. This is easiest with a single input at the top of the cell, but is still possible with one or more side inputs, depending on the location of the outputs.

The easiest way to stack hooks is to leave them at the spawn point and spawn more on top. Moving hooks and stacking them manually makes it hard to realign them perfectly to get the chaotic interaction, although they will still interact in unexpected ways. Wheels however can be effectively moved and stacked manually.

Adding another object on top may freeze the movement if the object is large large enough. A brick or a round Bonk will not significantly affect the Wheel, nor will a Black Hole or Repulser, but a Board, which extends beyond the Wheel, will lock it in place. The chaotic effects remain even when the wheels aren't moving - the balls seem to react as if they were spinning at high RPMs. [[User:Yusagi Yojimbo|Yusagi Yojimbo]] ([[User talk:Yusagi Yojimbo|talk]]) 17:22, 6 May 2024 (UTC)

== Wheel/Fan page crash ==

If you place a fan close to a wheel, such that the middle of the fan is about in line with the bottom edge of the lower wheel blade, and the fan blades are just barely touching the wheel blade, then the wheel accelerates apparently without bound. Eventually any ball that touches the wheel simply disappears from the page. Around 20 seconds later (as the wheel continues to accelerate apparently) the page crashes upon the next ball impact, with a javascript error:

<pre>Uncaught RuntimeError: unreachable executed
stepWithEvents rapier_wasm2d_bg.js:2726
step physics_pipeline.js:16
step world.js:111</pre>

At that point you lose your creation, which sadly I learned the hard way. This is fairly easy to reproduce. --[[Special:Contributions/172.71.166.206|172.71.166.206]] 01:23, 7 May 2024 (UTC)

I can't seem to get this to work. It could be because I'm dumb, though. That happens sometimes. [[User:Psychoticpotato|Psychoticpotato]] ([[User talk:Psychoticpotato|talk]]) 00:00, 14 May 2024 (UTC)

https://imgur.com/a/EhzlbCV --[[Special:Contributions/172.68.26.74|172.68.26.74]] 13:48, 15 May 2024 (UTC)

== Another glitch ==

Some pairs, like "xt=6&yt=124" and "xt=7&yt=124" cause a glitch. It is not related to the machine, for it is consistent for me (Fx 126.0.1, Windows 11). Does anyone else have these issues? [[Special:Contributions/172.70.34.11|172.70.34.11]] 19:02, 7 June 2024 (UTC)

Yes the live huge machine is crashing very frequently now. If I scroll around it will crash and just freeze permanently. I can't tell which panel or panels is causing the crash though. Maybe it's just gotten too big? [[Special:Contributions/172.69.64.240|172.69.64.240]]

== Yet Another glitch ==

If you press a ball against the wall it clips out kinda cool {{unsigned|Xkcd machine guy|09:39, 16 June 2024}}
:You can observe this with pressing balls between (solid) elements, too, having placed one item (or more) then shifting a further one into contact with the prior(s) with a ball already landed there. (I ought to try it with two 'cups', mutually inverted, trap a ball in one then move either straight across the other.)
:It's often useful to (temporarily) clear out a system jam by sweeping the balls around with a throwaway object, but also you can force their time-outs by making their existence untenable (after some scene-editing that temporarily sent streams in totally in the wrong direction). [[Special:Contributions/162.158.49.94|162.158.49.94]] 14:04, 16 June 2024 (UTC)

== Entirely broken? ==

I can no longer play the game (have tried on two different computers, repeatedly for the last 24 hours). Starts out in the machine view, the machine freezes immediately, and there's no edit button. -- [[User:Rei|Rei]] ([[User talk:Rei|talk]]) 22:10, 21 June 2024 (UTC)

2945: Broken Model

2024-06-15T01:26:38Z

Rei: Do we really need to explain 6th grade biology about how plants work, complete with a link on the topic? *facepalm*

{{comic
| number = 2945
| date = June 12, 2024
| title = Broken Model
| image = broken_model_2x.png
| imagesize = 278x448px
| noexpand = true
| titletext = In addition to eating foxes, rabbits can eat grass. The grass also eats foxes. Our equations chart the contours of Fox Hell.
}}

==Explanation==
{{incomplete|Created by Judas Priest. Do NOT delete this tag too soon. Otherwise, the KILLER RABBIT may come for you.}}
This comic shows [[Miss Lenhart]] explaining a mathematical model of a predator-prey relationship. The model has the terms swapped, showing that 400 rabbits are preying on 20 foxes. The teacher realizes this mistake and says "If this were an ecology class, I would have to fix that." Instead of fixing the model, though, she instead begins to calculate using this flawed model, and notes that this model implies that rabbits are carnivores.

The equations start with Nrabbits(0)=400 and Nfoxes(0)=20, the number of rabbits and foxes at time 0, followed by what looks like the {{w|Lotka–Volterra equations}}, a pair of first-order nonlinear differential equations, frequently used to describe the dynamics of biological systems in which two species interact. One of the pair of equations describes the number of prey over time, the other the number of predators over time, differing only by a negative sign (and coefficients). It is easy to mix up which equation describes which species, leading to the inverted predator-prey relation described.

If this was indeed the case the rabbits would soon render the foxes extinct. The reason this doesn't happen in reality for rabbits is that they outnumber the foxes (20 foxes vs 400 rabbits) and thus can survive being preyed upon. Often the predator takes the old and sick animals first, thus keeping the rest of the animals more healthy. But following the math of the wrong formula would soon lead to zero foxes. As per the title text, the rabbits could survive without the foxes to prey on, since they still eat grass. However, this reality is terrifying for the foxes, because they are rendered as prey.

The title text extends the joke by looking at a even more flawed model. This model has grass as well, but instead of grass and foxes not interacting, grass eats foxes, creating a "Fox Hell."
In the real world, grass doesn't hunt foxes{{citation needed}}, but instead, grass pulls nutrients from air and soil and synthesizes its energy through [https://soandmo.com/blogs/blog/where-does-the-grass-plant-get-its-energy-from photosynthesis]{{fact}}, and may use foxes that have already died from other causes as fertilizer. Foxes do occasionally [https://www.wildlifeonline.me.uk/animals/article/red-fox-diet-what-foxes-eat eat grass], although not as food, but for other health reasons.

==Transcript==
:[Miss Lenhart is holding a pointer to a whiteboard, indicating the last part of the last line of text.]
:Miss Lenhart: Hmm, looks like I accidentally swapped the predation terms.
:Miss Lenhart: If this were an ecology class, I would have to fix that.
:Miss Lenhart: Unfortunately for those 20 poor foxes, this is calculus, and the math says these 400 rabbits are hungry for meat.

:[There are three lines on the white board, where the '...' ellipses in the bottom line are illegible:]
:Nrabbits(0) = 400
:Nfoxes(0) = 20
:dN0/dt = ... dN.../... = ...

:[Caption below the panel:]
:Every broken mathematical model is just a glimpse into a terrifying alternate universe.

{{comic discussion}}

[[Category:Comics featuring Miss Lenhart]]
[[Category:Math]]
[[Category:Biology]]
[[Category:Animals]]

2719: Hydrogen Isotopes

2023-01-03T14:27:48Z

Rei: /* Explanation */ Wikified.

{{comic
| number = 2719
| date = January 2, 2023
| title = Hydrogen Isotopes
| image = hydrogen_isotopes_2x.png
| imagesize = 442x250px
| noexpand = true
| titletext = Oops, All Neutrons is also known as Neutral Quadrium, Nydnonen, and Goth Tritium.
}}

==Explanation==
{{incomplete|Created by a BREAK ROOM DE BROGLIE MICROWAVE USER. Do NOT delete this tag too soon.}}

{{W|Hydrogen}} is the simplest of the chemical atoms, usually consisting of an electron orbiting an proton. This comic imagines other humorous fictional forms of hydrogen as follows:

{| class="wikitable"
! "Isotope"
! Real?
! Description
|-
|Hydrogen
|Yes
|Hydrogen is the most common {{w|isotope}} of hydrogen, with one proton and one electron, shown with the electron orbiting the proton. It is also known as protium.
|-
|Deuterium
|Yes
|Deuterium is the second most common isotope of hydrogen, with one electron and both a neutron and proton in its nucleus. About one of every 6,760 hydrogen atoms in seawater is deuterium.
|-
|Tritium
|Yes
|Tritium is the third most common isotope of hydrogen, with one electron and a nucleus of one proton and two neutrons, for an atomic mass of about three {{w|Dalton (unit)|daltons}}. It is radioactive with a half-life of about twelve years, and is very rare (but not as rare as unbound "instant hydrogen" neutrons.)
|-
|Ium
|Not as such
|This imaginary isotope consists of one electron orbiting around nothing. The name relates to the fact that the two heavier isotopes are named from a prefix designating the number of {{w|nucleons}} followed by the suffix "-ium", which is sometimes used satirically, e.g., in "unobtainium." Free electrons are always in motion, {{w|Fermi energy|even at absolute zero temperature}}, but not in stationary orbits. If were to to treat this as an atom, it would effectively instantly undergo [https://en.wikipedia.org/wiki/Beta_decay#%CE%B2+_decay β− decay].
|-o
|Wheelium
|No
|This fictional form consists of a proton, electron, and neutron orbiting around nothing, shaped similarly to a wheel. The neutron would either bind to the proton, or much more likely, be [https://en.wikipedia.org/wiki/Elastic_scattering#Nuclear_particle_physics elastically scattered away].
|-
|Instant hydrogen (ready in 15 minutes)
|Yes, but rare
|This is just a single neutron. Unbound neutrons will take about fifteen minutes to decay into a proton, an electron, and a neutrino. The neutrino will carry away momentum, while the proton and electron ''can'' form into a hydrogen atom. However, this [https://van.physics.illinois.edu/ask/listing/1207 only happens about four times in a million] (though the proton could also capture another electron). The name is likely a reference to "instant" meals (e.g. instant noodles) which are typically reduced in form for convenient storage, and can be simply reconstituted into their usable form. While this appears, on the face of it, to follow a similar approach, it would not be as practical as an instant meal.
|-
|Hydrogen (maximum strength)
|No
|This fictional isotope consists of a proton, an electron, and what appear to be at least 14 neutrons. This isotope's proton would not be bound to all the neutrons. It would immediately decay by {{w|Nuclear drip line|dripping}} most all of them away.
|-
|Oops, All Neutrons
|Maybe
|This fictional form consists of four neutrons, a {{w|tetraneutron}}, with one orbiting around a group of three. The name is likely a reference to an American breakfast cereal called {{w|Cap'n Crunch#Variations|Oops! All Berries}}.

The title text provides three other names of this form: 1. "Neutral Quadrium": [https://www.yourdictionary.com/quadrium Quadrium] is a rare but real isotope of hydrogen consisting of one proton and three neutrons (the "quad-" prefix designating its four nucleons). The proton and electron in quadrium have both been replaced with neutrons, making this fictional atom neutral. 2. "Nydnonen" is likely a derivation of "hydrogen" with three of its consonants replaced with the letter 'n' so it has four of them representing the four neutrons. 3. "Goth Tritium": All the particles in the depiction are black, resembling stereotypical {{w|gothic fashion}}, and in the same configuration as the particles of tritium.
|}

{{notice2|The Mountain View, California Public Library is hosting an online chat with [[Randall Munroe]] Tuesday, January 31 at 11am Pacific. [https://libraryc.org/mountainviewlibrary/22032 Register here to send your question(s) to the moderators.]|image=Crystal Project Agt announcements.png}} 

==Transcript==
:[Eight drawings of different versions of hydrogen atoms are shown. They are arranged in two rows of four. The depictions use the planetary model version with for instance a negative electron (with a "-" written inside a small circle) orbiting a positive proton (with a "+" written inside a larger circle) and a black neutron depicted as a circle of the same size as the neutron, as in the second atom - Deuterium. Each has a label underneath. Here, they are listed in reading order:]
:[An electron orbiting a proton:]
:Hydrogen

:[An electron orbiting a proton connected with a neutron:]
:Deuterium

:[An electron orbiting a proton connected with two neutrons, so they form a triangle:]
:Tritium

:[An electron orbiting nothing:]
:Ium

:[An electron a proton and a neutron all orbiting on the same circle around nothing. They are placed equidistant from each other forming a large triangle:]
:Wheelium

:[A single proton:]
:Instant Hydrogen (ready in 15 minutes)

:[An electron orbiting a proton connected with many neutrons, 13 visible with six touching the proton which are in front. Four more are close to those six and mostly shown and then three are only just visible behind the others. Looking closely there are also two smaller dots near the edge indicating at least two more, for 15 that can be seen. And several more would be behind the visible neutrons if this forms a spherical shape. The electrons orbit just barely goes around the outer neutrons:]
:Hydrogen (maximum strength)

:[Four neutrons arranged like the particles in Tritium with a neutron orbiting a triangle of neutrons.]
:Oops, all neutrons

{{comic discussion}}

[[Category:Charts]]
[[Category:Physics]]
[[Category:Chemistry]]

2719: Hydrogen Isotopes

2023-01-03T14:25:56Z

Rei: β− decay

{{comic
| number = 2719
| date = January 2, 2023
| title = Hydrogen Isotopes
| image = hydrogen_isotopes_2x.png
| imagesize = 442x250px
| noexpand = true
| titletext = Oops, All Neutrons is also known as Neutral Quadrium, Nydnonen, and Goth Tritium.
}}

==Explanation==
{{incomplete|Created by a BREAK ROOM DE BROGLIE MICROWAVE USER. Do NOT delete this tag too soon.}}

{{W|Hydrogen}} is the simplest of the chemical atoms, usually consisting of an electron orbiting an proton. This comic imagines other humorous fictional forms of hydrogen as follows:

{| class="wikitable"
! "Isotope"
! Real?
! Description
|-
|Hydrogen
|Yes
|Hydrogen is the most common {{w|isotope}} of hydrogen, with one proton and one electron, shown with the electron orbiting the proton. It is also known as protium.
|-
|Deuterium
|Yes
|Deuterium is the second most common isotope of hydrogen, with one electron and both a neutron and proton in its nucleus. About one of every 6,760 hydrogen atoms in seawater is deuterium.
|-
|Tritium
|Yes
|Tritium is the third most common isotope of hydrogen, with one electron and a nucleus of one proton and two neutrons, for an atomic mass of about three {{w|Dalton (unit)|daltons}}. It is radioactive with a half-life of about twelve years, and is very rare (but not as rare as unbound "instant hydrogen" neutrons.)
|-
|Ium
|Not as such
|This imaginary isotope consists of one electron orbiting around nothing. The name relates to the fact that the two heavier isotopes are named from a prefix designating the number of {{w|nucleons}} followed by the suffix "-ium", which is sometimes used satirically, e.g., in "unobtainium." Free electrons are always in motion, {{w|Fermi energy|even at absolute zero temperature}}, but not in stationary orbits. If were to to treat this as an atom, it would effectively instantly undergo β− decay.
|-o
|Wheelium
|No
|This fictional form consists of a proton, electron, and neutron orbiting around nothing, shaped similarly to a wheel. The neutron would either bind to the proton, or much more likely, be elastically scattered away.
|-
|Instant hydrogen (ready in 15 minutes)
|Yes, but rare
|This is just a single neutron. Unbound neutrons will take about fifteen minutes to decay into a proton, an electron, and a neutrino. The neutrino will carry away momentum, while the proton and electron ''can'' form into a hydrogen atom. However, this [https://van.physics.illinois.edu/ask/listing/1207 only happens about four times in a million] (though the proton could also capture another electron). The name is likely a reference to "instant" meals (e.g. instant noodles) which are typically reduced in form for convenient storage, and can be simply reconstituted into their usable form. While this appears, on the face of it, to follow a similar approach, it would not be as practical as an instant meal.
|-
|Hydrogen (maximum strength)
|No
|This fictional isotope consists of a proton, an electron, and what appear to be at least 14 neutrons. This isotope's proton would not be bound to all the neutrons. It would immediately decay by {{w|Nuclear drip line|dripping}} most all of them away.
|-
|Oops, All Neutrons
|Maybe
|This fictional form consists of four neutrons, a {{w|tetraneutron}}, with one orbiting around a group of three. The name is likely a reference to an American breakfast cereal called {{w|Cap'n Crunch#Variations|Oops! All Berries}}.

The title text provides three other names of this form: 1. "Neutral Quadrium": [https://www.yourdictionary.com/quadrium Quadrium] is a rare but real isotope of hydrogen consisting of one proton and three neutrons (the "quad-" prefix designating its four nucleons). The proton and electron in quadrium have both been replaced with neutrons, making this fictional atom neutral. 2. "Nydnonen" is likely a derivation of "hydrogen" with three of its consonants replaced with the letter 'n' so it has four of them representing the four neutrons. 3. "Goth Tritium": All the particles in the depiction are black, resembling stereotypical {{w|gothic fashion}}, and in the same configuration as the particles of tritium.
|}

{{notice2|The Mountain View, California Public Library is hosting an online chat with [[Randall Munroe]] Tuesday, January 31 at 11am Pacific. [https://libraryc.org/mountainviewlibrary/22032 Register here to send your question(s) to the moderators.]|image=Crystal Project Agt announcements.png}} 

==Transcript==
:[Eight drawings of different versions of hydrogen atoms are shown. They are arranged in two rows of four. The depictions use the planetary model version with for instance a negative electron (with a "-" written inside a small circle) orbiting a positive proton (with a "+" written inside a larger circle) and a black neutron depicted as a circle of the same size as the neutron, as in the second atom - Deuterium. Each has a label underneath. Here, they are listed in reading order:]
:[An electron orbiting a proton:]
:Hydrogen

:[An electron orbiting a proton connected with a neutron:]
:Deuterium

:[An electron orbiting a proton connected with two neutrons, so they form a triangle:]
:Tritium

:[An electron orbiting nothing:]
:Ium

:[An electron a proton and a neutron all orbiting on the same circle around nothing. They are placed equidistant from each other forming a large triangle:]
:Wheelium

:[A single proton:]
:Instant Hydrogen (ready in 15 minutes)

:[An electron orbiting a proton connected with many neutrons, 13 visible with six touching the proton which are in front. Four more are close to those six and mostly shown and then three are only just visible behind the others. Looking closely there are also two smaller dots near the edge indicating at least two more, for 15 that can be seen. And several more would be behind the visible neutrons if this forms a spherical shape. The electrons orbit just barely goes around the outer neutrons:]
:Hydrogen (maximum strength)

:[Four neutrons arranged like the particles in Tritium with a neutron orbiting a triangle of neutrons.]
:Oops, all neutrons

{{comic discussion}}

[[Category:Charts]]
[[Category:Physics]]
[[Category:Chemistry]]

2719: Hydrogen Isotopes

2023-01-03T14:23:12Z

Rei: Elastic scattering for the free neutron

{{comic
| number = 2719
| date = January 2, 2023
| title = Hydrogen Isotopes
| image = hydrogen_isotopes_2x.png
| imagesize = 442x250px
| noexpand = true
| titletext = Oops, All Neutrons is also known as Neutral Quadrium, Nydnonen, and Goth Tritium.
}}

==Explanation==
{{incomplete|Created by a BREAK ROOM DE BROGLIE MICROWAVE USER. Do NOT delete this tag too soon.}}

{{W|Hydrogen}} is the simplest of the chemical atoms, usually consisting of an electron orbiting an proton. This comic imagines other humorous fictional forms of hydrogen as follows:

{| class="wikitable"
! "Isotope"
! Real?
! Description
|-
|Hydrogen
|Yes
|Hydrogen is the most common {{w|isotope}} of hydrogen, with one proton and one electron, shown with the electron orbiting the proton. It is also known as protium.
|-
|Deuterium
|Yes
|Deuterium is the second most common isotope of hydrogen, with one electron and both a neutron and proton in its nucleus. About one of every 6,760 hydrogen atoms in seawater is deuterium.
|-
|Tritium
|Yes
|Tritium is the third most common isotope of hydrogen, with one electron and a nucleus of one proton and two neutrons, for an atomic mass of about three {{w|Dalton (unit)|daltons}}. It is radioactive with a half-life of about twelve years, and is very rare (but not as rare as unbound "instant hydrogen" neutrons.)
|-
|Ium
|Not as such
|This imaginary isotope consists of one electron orbiting around nothing. The name relates to the fact that the two heavier isotopes are named from a prefix designating the number of {{w|nucleons}} followed by the suffix "-ium", which is sometimes used satirically, e.g., in "unobtainium." Free electrons are always in motion, {{w|Fermi energy|even at absolute zero temperature}}, but not in stationary orbits.
|-o
|Wheelium
|No
|This fictional form consists of a proton, electron, and neutron orbiting around nothing, shaped similarly to a wheel. The neutron would either bind to the proton, or much more likely, be elastically scattered away.
|-
|Instant hydrogen (ready in 15 minutes)
|Yes, but rare
|This is just a single neutron. Unbound neutrons will take about fifteen minutes to decay into a proton, an electron, and a neutrino. The neutrino will carry away momentum, while the proton and electron ''can'' form into a hydrogen atom. However, this [https://van.physics.illinois.edu/ask/listing/1207 only happens about four times in a million] (though the proton could also capture another electron). The name is likely a reference to "instant" meals (e.g. instant noodles) which are typically reduced in form for convenient storage, and can be simply reconstituted into their usable form. While this appears, on the face of it, to follow a similar approach, it would not be as practical as an instant meal.
|-
|Hydrogen (maximum strength)
|No
|This fictional isotope consists of a proton, an electron, and what appear to be at least 14 neutrons. This isotope's proton would not be bound to all the neutrons. It would immediately decay by {{w|Nuclear drip line|dripping}} most all of them away.
|-
|Oops, All Neutrons
|Maybe
|This fictional form consists of four neutrons, a {{w|tetraneutron}}, with one orbiting around a group of three. The name is likely a reference to an American breakfast cereal called {{w|Cap'n Crunch#Variations|Oops! All Berries}}.

The title text provides three other names of this form: 1. "Neutral Quadrium": [https://www.yourdictionary.com/quadrium Quadrium] is a rare but real isotope of hydrogen consisting of one proton and three neutrons (the "quad-" prefix designating its four nucleons). The proton and electron in quadrium have both been replaced with neutrons, making this fictional atom neutral. 2. "Nydnonen" is likely a derivation of "hydrogen" with three of its consonants replaced with the letter 'n' so it has four of them representing the four neutrons. 3. "Goth Tritium": All the particles in the depiction are black, resembling stereotypical {{w|gothic fashion}}, and in the same configuration as the particles of tritium.
|}

{{notice2|The Mountain View, California Public Library is hosting an online chat with [[Randall Munroe]] Tuesday, January 31 at 11am Pacific. [https://libraryc.org/mountainviewlibrary/22032 Register here to send your question(s) to the moderators.]|image=Crystal Project Agt announcements.png}} 

==Transcript==
:[Eight drawings of different versions of hydrogen atoms are shown. They are arranged in two rows of four. The depictions use the planetary model version with for instance a negative electron (with a "-" written inside a small circle) orbiting a positive proton (with a "+" written inside a larger circle) and a black neutron depicted as a circle of the same size as the neutron, as in the second atom - Deuterium. Each has a label underneath. Here, they are listed ion reading order:]
:[An electron orbiting a proton:]
:Hydrogen

:[An electron orbiting a proton connected with a neutron:]
:Deuterium

:[An electron orbiting a proton connected with two neutrons, so they form a triangle:]
:Tritium

:[An electron orbiting nothing:]
:Ium

:[An electron a proton and a neutron all orbiting on the same circle around nothing. They are placed equidistant from each other forming a large triangle:]
:Wheelium

:[A single proton:]
:Instant Hydrogen (ready in 15 minutes)

:[An electron orbiting a proton connected with many neutrons, 13 visible with six touching the proton which are in front. Four more are close to those six and mostly shown and then three are only just visible behind the others. Looking closely there are also two smaller dots near the edge indicating at least two more, for 15 that can be seen. And several more would be behind the visible neutrons if this forms a spherical shape. The electrons orbit just barely goes around the outer neutrons:]
:Hydrogen (maximum strength)

:[Four neutrons arranged like the particles in Tritium with a neutron orbiting a triangle of neutrons.]
:Oops, all neutrons

{{comic discussion}}

[[Category:Charts]]
[[Category:Physics]]
[[Category:Chemistry]]

2151: A/B

2019-05-17T16:53:28Z

Rei: More clarity.

{{comic
| number = 2151
| date = May 17, 2019
| title = A/B
| image = a_b.png
| titletext = We wrote our site in Linear A rather than Askara Kawi because browser testing showed that Crete script rendered faster than Java script.
}}

==Explanation==
{{incomplete|Written in MYCENEAN GREEK. Please mention here why this explanation isn't complete. Do NOT delete this tag too soon.}}
{{w|A/B testing}} is a form of {{w|Scientific control|controlled experiment}} in which test subjects are randomly split into two groups, A and B, and each group is shown a slightly different version of the same thing. This is most often used for market research, as it allows researchers to discover which of two options are received more favorably by consumers. For example, a website might employ A/B testing by randomly showing 50% of visitors a version with a different font. By checking their site traffic analytics afterward, the site operators can see which version of the site received the most user engagement, which might tell them that the alternate font is a better choice.

{{w|Linear A}}, on the other hand, is an as-of-yet undeciphered writing system of the ancient Minoan civilization. It appears similar to the deciphered Linear B writing system, but if the pronunciation rules of Linear B are applied to Linear A, it produces a language unrelated to any known language.

{{w|Linear B}} is a syllabic script that was used for writing Mycenaean Greek, the earliest attested form of Greek.

The comic jokingly suggests that the choice of writing system could be decided through A/B testing. The test subject apparently can read Linear B (which encodes Mycenaean Greek), but not Linear A (which produces what's seemingly gibberish when read through the rules of Linear B).

{{w|Kawi script|Askara Kawi}} is a writing system used on the island of Java (today part of Indonesia). As per the title text, Linear A is not being used to encode the information presented to the user (i.e. {{w|natural language}}), but rather the code which defines how or what is presented to the user (i.e. {{w|programming language}}). That is to say, Askara Kawi is a script (i.e. a writing system) from the island of Java, and thus being humorously presented as equivalent to {{w|JavaScript}}, which is a common way to encode dynamic content on webpages.

Linear A and Linear B are also script engines used in early versions of the Opera web browser.

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

{{comic discussion}}

2151: A/B

2019-05-17T16:51:07Z

Rei: Not happy with the way this text was. It's pretty clear that the two languages being compared are Linear A and Linear B, not Linear A and Askara Kawi. That's a separate joke.

{{comic
| number = 2151
| date = May 17, 2019
| title = A/B
| image = a_b.png
| titletext = We wrote our site in Linear A rather than Askara Kawi because browser testing showed that Crete script rendered faster than Java script.
}}

==Explanation==
{{incomplete|Written in MYCENEAN GREEK. Please mention here why this explanation isn't complete. Do NOT delete this tag too soon.}}
{{w|A/B testing}} is a form of {{w|Scientific control|controlled experiment}} in which test subjects are randomly split into two groups, A and B, and each group is shown a slightly different version of the same thing. This is most often used for market research, as it allows researchers to discover which of two options are received more favorably by consumers. For example, a website might employ A/B testing by randomly showing 50% of visitors a version with a different font. By checking their site traffic analytics afterward, the site operators can see which version of the site received the most user engagement, which might tell them that the alternate font is a better choice.

{{w|Linear A}}, on the other hand, is an as-of-yet undeciphered writing system of the ancient Minoan civilization. It appears similar to the deciphered Linear B writing system, but if the pronunciation rules of Linear B are applied to Linear A, it produces a language unrelated to any known language.

{{w|Linear B}} is a syllabic script that was used for writing Mycenaean Greek, the earliest attested form of Greek.

The comic jokingly suggests that the choice of writing system could be decided through A/B testing. The test subject apparently can read Linear B (which encodes Mycenaean Greek), but not Linear A (which produces what's seemingly gibberish when read through the rules of Linear B).

{{w|Kawi script|Askara Kawi}} is a writing system used on the island of Java (today part of Indonesia). The title text also reveals the reason why the writing systems are being tested on a computer: they are not being used to encode the information presented to the user (i.e. {{w|natural language}}), but the code which defines how or what is presented to the user (i.e. {{w|programming language}}).

Askara Kawi was chosen as the control group because, apparently, knowing it was a script (i.e. a writing system) from the island of Java, it was misinterpreted as what it meant to use {{w|JavaScript}}, which is a common way to encode dynamic content on webpages.

Linear A and Linear B are also script engines used in early versions of the Opera web browser.

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

{{comic discussion}}

2151: A/B

2019-05-17T16:06:37Z

Rei:

{{comic
| number = 2151
| date = May 17, 2019
| title = A/B
| image = a_b.png
| titletext = We wrote our site in Linear A rather than Askara Kawi because browser testing showed that Crete script rendered faster than Java script.
}}

==Explanation==
{{incomplete|Written in MYCENEAN GREEK. Please mention here why this explanation isn't complete. Do NOT delete this tag too soon.}}
{{w|A/B testing}} refers to any {{w|Scientific control|controlled experiment}} where test subjects are split into two groups (the titular A and B) to compare their reactions to a product, and the product with a slight variation, most often used for market research. For example, a website might appear the same to different users except for a different font, so that the operators of the site can determine how the font affects the user's interaction with the site (time spent on it, clicks, purchases, etc).

{{w|Linear A}} Linear A is an as-of-yet undeciphered writing system of the ancient Minoan civilization. It appears similar to the deciphered Linear B writing system, but if the pronunciation rules of Linear B are applied to Linear A, it produces a language unrelated to any known language.

The comic jokingly suggests that the choice of writing system could be decided through A/B testing. The test subject apparently can read either Linear A or Linear B, but not the alternative, which the title text suggests is {{w|Kawi script|Askara Kawi}}, a writing system used on the island of Java (today part of Indonesia). This suggest the subject is Greek, and Askara Kawi is {{w|Greek to me|greek to him}}.

The title text also reveals the reason why the writing systems are being tested on a computer: they are not being used to encode the information presented to the user (i.e. {{w|natural language}}), but the code which defines how or what is presented to the user (i.e. {{w|programming language}}).

Askara Kawi was chosen as the control group because, apparently, knowing it was a script (i.e. a writing system) from the island of Java, it was misinterpreted as what it meant to use {{w|JavaScript}}, which is a common way to encode dynamic content on webpages.

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

{{comic discussion}}