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		<title>explain xkcd - User contributions [en]</title>
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		<id>https://www.explainxkcd.com/wiki/index.php?title=User:FaviFake&amp;diff=366640</id>
		<title>User:FaviFake</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=User:FaviFake&amp;diff=366640"/>
				<updated>2025-02-24T17:23:54Z</updated>
		
		<summary type="html">&lt;p&gt;141.101.109.166: /* Your suggestions! What should I ask? */&lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;&amp;lt;big&amp;gt;{{TOC}}&amp;lt;/big&amp;gt;'''Hey everyone! I got in touch with [[Randall Munroe]] himself!! Here's what you need to know.'''&lt;br /&gt;
&lt;br /&gt;
I emailed him to ask for the official release date of [[36: Scientists]] (see [[36: Scientists#Trivia|the trivia for more info]]). Surprisingly, he got back to me! You can read the conversation, with a summary of his messages, below. I'll keep you posted if I receive more messages! You can [https://www.explainxkcd.com/wiki/index.php?title=User:FaviFake&amp;amp;action=watch add this page to your watchlist] to keep track of it. I haven't received his explicit permission to feature his messages in full, so it seemed ethical to hide his messages. My emails have not been altered, but in the copy-pasting, links have been removed. These emails were all hyperlinked, I now added back only a few links. The reason I waited a few days before publishing them is because I was very busy.&lt;br /&gt;
&lt;br /&gt;
In his last email, Randall expressed willingness to answer a few more questions, particularly simpler, administrative questions (like the one he answered already), but kindly explained he prefers to avoid too much meta-commentary. Because I didn't want to come up with every question and I wanted to hear everyone, I'll try to send him some that you want, if he agrees to receiving more! You can [[#Your suggestions! What should I ask?|add your suggestions here!]].&lt;br /&gt;
&lt;br /&gt;
===Email thread===&lt;br /&gt;
{| class=&amp;quot;wikitable&amp;quot;&lt;br /&gt;
|'''Question from the Explain xkcd wiki regarding one of your comics'''&lt;br /&gt;
Email thread - 4 messages —&lt;br /&gt;
Here's a [https://imgur.com/a/2StTkvJ screenshot of one of the emails], if you need some sort of proof.&lt;br /&gt;
|}&lt;br /&gt;
&lt;br /&gt;
{| class=&amp;quot;wikitable&amp;quot;&lt;br /&gt;
|'''FaviFake''' &amp;lt;[email redacted]@gmail.com&amp;gt;&lt;br /&gt;
|14 February 2025 at 19:16 CET&lt;br /&gt;
|-&lt;br /&gt;
| colspan=&amp;quot;2&amp;quot; |To: Randall Munroe &amp;lt;[Randall's email redacted]@gmail.com&amp;gt;&lt;br /&gt;
|-&lt;br /&gt;
| colspan=&amp;quot;2&amp;quot; |&lt;br /&gt;
&lt;br /&gt;
Hi,&lt;br /&gt;
I'm an editor at explainxkcd.com, which you probably know is the wiki that explains all your comics and provides as much info as possible on them.&lt;br /&gt;
{| class=&amp;quot;wikitable&amp;quot;&lt;br /&gt;
|''[In the copy-pasting, links have been removed. These emails were all hyperlinked, I now added back only a few links.]''&lt;br /&gt;
|}&lt;br /&gt;
In pursuit of that goal, we have always had an unsolved mystery only you can solve. Comic [[36: Scientists]] was originally posted as a duplicate of comic [[10: Pi Equals]]. You corrected this sometime between April 23, 2006 and July 5, 2006 , when the current version showed up in the web archive (see the two links). The comic looks like one of your old drawings.&lt;br /&gt;
&lt;br /&gt;
So, explain xkcd thinks that when you realized your mistake (over three months after it was originally posted), you probably found an old unused drawing and posted it, to not make it stand out compared to the other comics from that time. This all means we have no date for this comic, since it could've been posted anytime between the two dates mentioned above. You can read more about this here. (If you're interested, we have a more comprehensive history of your webcomic here.)&lt;br /&gt;
&lt;br /&gt;
Could you kindly help us figure this out by checking when you released comic #[[36]], so we can add an official date to it? This is one of the only official comics which we don't know the date of.&lt;br /&gt;
&lt;br /&gt;
Kind regards,&lt;br /&gt;
&lt;br /&gt;
FaviFake&lt;br /&gt;
&lt;br /&gt;
editor @ explain xkcd&lt;br /&gt;
|}&lt;br /&gt;
{| class=&amp;quot;wikitable&amp;quot;&lt;br /&gt;
|'''Randall Munroe''' [Randall's email redacted]&lt;br /&gt;
|14 February 2025 at 22:20 CET&lt;br /&gt;
|-&lt;br /&gt;
| colspan=&amp;quot;2&amp;quot; |To: FaviFake &amp;lt;[email redacted]@gmail.com&amp;gt;&lt;br /&gt;
|-&lt;br /&gt;
| colspan=&amp;quot;2&amp;quot; |FaviFake,&lt;br /&gt;
{| class=&amp;quot;wikitable&amp;quot;&lt;br /&gt;
|''[Randall replies, giving the official date when &amp;lt;b&amp;gt;[[36: Scientists]]&amp;lt;/b&amp;gt; was swapped: April 28th.]''&lt;br /&gt;
''[He ends with:]''&lt;br /&gt;
|}&lt;br /&gt;
Thank you for your tireless documentation effort :)&lt;br /&gt;
{| class=&amp;quot;wikitable&amp;quot;&lt;br /&gt;
|''[He signs]''&lt;br /&gt;
|}&lt;br /&gt;
[Quoted text hidden]&lt;br /&gt;
|}&lt;br /&gt;
{| class=&amp;quot;wikitable&amp;quot;&lt;br /&gt;
|'''FaviFake''' &amp;lt;[email redacted]@gmail.com&amp;gt;&lt;br /&gt;
|15 February 2025 at 17:39 CET&lt;br /&gt;
|-&lt;br /&gt;
| colspan=&amp;quot;2&amp;quot; |To: Randall Munroe &amp;lt;[Randall's email redacted]@gmail.com&amp;gt;&lt;br /&gt;
|-&lt;br /&gt;
| colspan=&amp;quot;2&amp;quot; |Hello Randall,&lt;br /&gt;
&lt;br /&gt;
Thank you so much for your response!! I'm certain the rest of the community will be thrilled to have an official answer.&lt;br /&gt;
&lt;br /&gt;
Unfortunately, this is by far not the only &amp;quot;unsolved mystery&amp;quot; we have encountered in our research of your comic. Because we don't get to talk to you very often, I'd like to ask you if you can answer more of our many questions, if you're up for it. Of course, I do not want to annoy you or waste your time, so please let me know if this is something you'd enjoy! I will try to keep the questions entertaining for you.&lt;br /&gt;
&lt;br /&gt;
Kind regards,&lt;br /&gt;
&lt;br /&gt;
FaviFake&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
[Quoted text hidden]&lt;br /&gt;
|}&lt;br /&gt;
{| class=&amp;quot;wikitable&amp;quot;&lt;br /&gt;
|'''Randall Munroe''' &amp;lt;[Randall's email redacted]@gmail.com&amp;gt;&lt;br /&gt;
|17 February 2025 at 19:02 CET&lt;br /&gt;
|-&lt;br /&gt;
| colspan=&amp;quot;2&amp;quot; |To: FaviFake &amp;lt;[email redacted]@gmail.com&amp;gt;&lt;br /&gt;
|-&lt;br /&gt;
| colspan=&amp;quot;2&amp;quot; |FaviFake,&lt;br /&gt;
{| class=&amp;quot;wikitable&amp;quot;&lt;br /&gt;
|''[He expresses willingness to answer some additional questions, particularly simpler, administrative questions (like the one he answered), but kindly explains he prefers to avoid too much meta-commentary]''&lt;br /&gt;
''[He ends with:]''&lt;br /&gt;
|}&lt;br /&gt;
And seriously, my heartfelt thanks to you and everyone there. It's such a privilege to make something that people think is worth so much effort to explain &amp;lt;3&lt;br /&gt;
&lt;br /&gt;
—Randall&lt;br /&gt;
&lt;br /&gt;
[Quoted text hidden]&lt;br /&gt;
|}&lt;br /&gt;
&lt;br /&gt;
{| class=&amp;quot;wikitable&amp;quot;&lt;br /&gt;
|'''FaviFake''' &amp;lt;[email redacted]@gmail.com&amp;gt;&lt;br /&gt;
|20 February 2025 at 18:07&lt;br /&gt;
|-&lt;br /&gt;
| colspan=&amp;quot;2&amp;quot; |To: Randall Munroe &amp;lt;[Randall's email redacted]@gmail.com&amp;gt;&lt;br /&gt;
|-&lt;br /&gt;
| colspan=&amp;quot;2&amp;quot; |Randall,&lt;br /&gt;
&lt;br /&gt;
Thank you for the kind words!! I really appreciate the offer. Next time, I'm thinking of asking the community for other simple and administrative questions, because I'm sure I don't represent everyone. &lt;br /&gt;
{| class=&amp;quot;wikitable&amp;quot;&lt;br /&gt;
|''I also asked for his permission to feature this conversation here:''&lt;br /&gt;
|}&lt;br /&gt;
(Also, would it be okay to feature your responses on our wiki?)&lt;br /&gt;
&lt;br /&gt;
I had drafted the paragraphs below in advance and I'm not sure if they fall outside the boundaries you mentioned, but I figured I’d ask anyway since this is a topic the other editors are very curious about. Of course, no worries if you’d rather not get into the details! We have plenty of simpler questions we can't answer ourselves. Here you go:&lt;br /&gt;
&lt;br /&gt;
On June 17, 2009, you released [[Conservation]] (along with IBM's accompanying blog post), the first comic created with IBM for their &amp;quot;A Smarter Planet&amp;quot; blog. You used the filename conservation.png, as usual. On August 11, 2009, the second comic of the series, [[Prescriptions]], was released (with its blog post), but this time you used an unusual filename: ibm_hc_1.png.&lt;br /&gt;
&lt;br /&gt;
We initially believed these were the only comics you created, mainly because they were the only ones featured on your page xkcd.com/asmarterplanet, but a little over a month ago we discovered two additional never-before-seen comics by experimenting with the image URLs for [[ibm_hc_2]].png and [[ibm_hc_3]].png. We believe you created these two comics as part of the IBM partnership, but for some reason they were never released publicly and were only accessible from imgs.xkcd.com. (Interestingly enough, they are still available!)&lt;br /&gt;
&lt;br /&gt;
Any additional info you can give us would help a ton! For example: their titles, when they were drawn or supposed to be released, or why they were never officially published. Thank you!&lt;br /&gt;
&lt;br /&gt;
—FaviFake&lt;br /&gt;
|}&lt;br /&gt;
===What I think I should reply back===&lt;br /&gt;
*I first asked for permission to make the conversation public, so you all can read what he said. I wasn't told not to make it public, I just think I should ask for permission first. I'm not even sure if this was the right thing. If you have thoughts, [[User talk:FaviFake#Contacting Randall Munroe|please send them to me on my talk page]]!&lt;br /&gt;
*I didn't think it was fair to do everything myself, so I wanted to also hear what you wanted to ask! Randall asked for simpler, administrative questions (like the one he answered), and not ones that required too much explaining. Please add your suggestions to the section below!&lt;br /&gt;
*I think in the first message we should send some of the easiest questions to answer, quick ones like &amp;quot;when was this released&amp;quot;, and then we can start to ask slightly more complex (but still administrative) questions.&lt;br /&gt;
&lt;br /&gt;
===Your suggestions! What should I ask?===&lt;br /&gt;
{{notice2|Remember, he said only simple questions. I'm assuming he'd like questions similar to the one he replied to(short, sweet,&amp;lt;br&amp;gt;no explaining needed), or questions that shouldn't require him to explain his comic more than he has already done.&lt;br /&gt;
&lt;br /&gt;
'''What's something relatively important that we don't know and that only Randall can answer in a few words?'''}}&lt;br /&gt;
{{notice|&lt;br /&gt;
&lt;br /&gt;
Format your suggestions like this:&lt;br /&gt;
&lt;br /&gt;
 &amp;lt;nowiki&amp;gt;SUMMARY OF SUGGESTION --~~~~ &amp;lt;/nowiki&amp;gt;&lt;br /&gt;
 &amp;lt;nowiki&amp;gt;:Explain in more detail your suggestion.&amp;lt;/nowiki&amp;gt;&amp;lt;br&amp;gt;&amp;lt;nowiki&amp;gt;::Discuss it and vote --~~~~&amp;lt;/nowiki&amp;gt;&lt;br /&gt;
Add new suggestions below the other ones.}}&lt;br /&gt;
&lt;br /&gt;
{{Done}}'''[[ibm_hc_2]] and [[ibm_hc_3]] (newly-discovered comics) and comic [[36: Scientists]]''' --[[User:FaviFake|FaviFake]] ([[User talk:FaviFake|talk]]) 16:34, 21 February 2025 (UTC)&lt;br /&gt;
:I asked this one already, because I assume it's the most important one right now. You can [[#Email thread|see my question above]].&lt;br /&gt;
&lt;br /&gt;
'''Why was what if? article ''[https://web.archive.org/web/20161205191559/http://what-if.xkcd.com/153 Peptides] deleted?'' --[[User:FaviFake|FaviFake]] ([[User talk:FaviFake|talk]]) 16:34, 21 February 2025 (UTC)'''&lt;br /&gt;
:[[what if? (blog)]] is a blog written by [[Randall]] with entries posted occasionally. On December 5, 2016, the article ''[https://web.archive.org/web/20161205191559/http://what-if.xkcd.com/153 Peptides]'' was published as number {{what if|153|153}}. However, it was [https://web.archive.org/web/20161206171630/http://what-if.xkcd.com/153/ removed the following day] and was replaced by a notice: &amp;quot;''Whoops. This article is still in progress. An early draft was unintentionally posted here thanks to Randall's &amp;lt;b&amp;gt;[http://xkcd.com/1597/ troubled approach to git]&amp;lt;/b&amp;gt;, and it took a little bit to get everything sorted out and rolled back. Sorry for the mixup!&amp;quot;''. No finished version of the article was ever published, and the URL was later reused for ''{{what if|153|Hide the Atmosphere}}''.&lt;br /&gt;
::I this this one is very interesting, but it might not be as administrative and short as Randall wants. He'd need to explain the reason why it wasn't published and why it looks like a complete article, not a &amp;quot;draft&amp;quot;. Anyone agree? --[[User:FaviFake|FaviFake]] ([[User talk:FaviFake|talk]]) 16:34, 21 February 2025 (UTC)&lt;br /&gt;
:::Copy paste from my reply below which I wrote first: &amp;quot;I'm not quite sure he likes questions about things he actually wished to delete... I mean seriously he tried to hide it but we got hold of it anyway?&amp;quot; --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 17:26, 23 February 2025 (UTC)&lt;br /&gt;
&lt;br /&gt;
'''What happened to [[Five-Minute Comics: Part 4]]? --[[User:CalibansCreations|'''&amp;lt;span style=&amp;quot;color:#ff0000;&amp;quot;&amp;gt;Caliban&amp;lt;/span&amp;gt;''']] ([[User talk:CalibansCreations|talk]]) 17:49, 22 February 2025 (UTC)'''&lt;br /&gt;
:A lost xkcd comic. He accidentally posted this instead of [[940]], and then erased all evidence of its existence by redirecting the direct image URL to a notice claiming it was a minor glitch in the universe. I'd get deleting the image outright, but just replacing it with what is essentially a sign to stop looking for it? Kinda weird. Also, how many more of these 5MCs has he made that are potentially lost media?&lt;br /&gt;
::I like this one, but I'm not sure if it's as simple as he'd like. He'd need to explain why he created the comic, which he almost never does. But there might be a way to ask it in a way that allows him to reply without revealing too much info. Btw, you seem very active on this wiki, do you have anything else in mind? --[[User:FaviFake|FaviFake]] ([[User talk:FaviFake|talk]]) 20:11, 22 February 2025 (UTC)&lt;br /&gt;
:::I'm not quite sure he likes questions about things he actually wished to delete... I mean seriously he tried to hide it but we got hold of it anyway? Also we know why he drew these, it was a game he played with family. He just did not mean to post the fourth one. There might be more, but he only posted the three because he could not cope with the cancer of his wife and did not whish to give up his schedule. So as he could not draw three comics fast enough for that week he used these instead. Asking into this would also remind him of his wife's cancer. I vote no to this as an e-mail to Randall!  [[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 17:24, 23 February 2025 (UTC)&lt;br /&gt;
&lt;br /&gt;
'''Why were the first comics uploaded seemingly randomly? --[[User:FaviFake|FaviFake]] ([[User talk:FaviFake|talk]]) 21:51, 22 February 2025 (UTC)&lt;br /&gt;
:Initially, randall posted his comics to LiveJournal ([[LiveJournal|learn more here]]). The new xkcd website opened on January 1, 2006, and the backlog of 41 comics from LiveJournal from [[1: Barrel - Part 1]] to [[44: Love]] was transferred on the same day, but in a completely different order. The only comic that has the same number on both sites is [[3: Island (sketch)]], while all the other comics were uploaded seemingly at random. Also, only eleven of the original comic titles were reused of the new site, and even among the last eleven comics posted on both sites, only six used the same title.&lt;br /&gt;
&lt;br /&gt;
'''When was [[Blue Eyes]] released? --[[User:FaviFake|FaviFake]] ([[User talk:FaviFake|talk]]) 11:01, 23 February 2025 (UTC)'''&lt;br /&gt;
:[[xkcd]]'s [[Blue Eyes]] puzzle is a logic puzzle posted around the same time as comic [[169: Words that End in GRY]]. [[Randall]] calls it &amp;quot;The Hardest Logic Puzzle in the World&amp;quot; on its page, but whether it really is the hardest is up to speculation. This is incorrect, as the comic was available long before October 11, 2006. The earliest date we have is [https://web.archive.org/web/20041024201125/http://68.57.186.221:8080/ October 24th, 2004] (see fourth link on the page), and the earliest version of the comic is from [https://web.archive.org/web/20041109034300/http://68.57.186.221:8080/blue_eyes.html November 4th, 2004]. Additionally, both the puzzle [https://xkcd.com/solution.html and the solution] (here's an [https://web.archive.org/web/20061102070433/https://xkcd.com/solution.html earlier version of the solution])were modified and updated several times since its release.&lt;br /&gt;
&lt;br /&gt;
'''Why are some of the april fools' comics late? - [[Special:Contributions/172.71.146.108|172.71.146.108]] 18:55, 22 February 2025 (UTC)'''&amp;lt;!--&lt;br /&gt;
i mean why ''are''. sorry, typo - [[Special:Contributions/172.71.146.108|172.71.146.108]] 18:56, 22 February 2025 (UTC)--&amp;gt;&lt;br /&gt;
:&amp;lt;!--(You were entitled to correct it, but I'm leaving it as is.) /Commented out &amp;amp; fixed by FaviFake--&amp;gt;I'm fairly sure we've had this answered already (&amp;quot;things just weren't quite ready/more testing was needed&amp;quot;) for some of the more technical ones, in some other place. Whether we can get more detail and for ''every'' not-on-time might be a matter of him having to remember the precise circumstances. And I also would feel uncomfortable if this turned into &amp;quot;why was &amp;lt;random non-April Fool comic&amp;gt; late?&amp;quot;. Or early. (When doing Rightpondian book-tours, sometimes surprisingly early, but every now and then it seems he manages to release them from his native Leftpondia even early here in the Rightpondian day.) But this is far too much detail (and far too much expectation), of no importance so long as he continues to average out at three regular comics a week and ''if he wants to'', and ''when he can'', anything a bit more special.&lt;br /&gt;
:Consider this a downvote on bothering him with this question, but that's of course only my opinion, in leiu of anything more constructive to add (&amp;quot;What's your favourite cheese..?&amp;quot;) [[Special:Contributions/172.69.79.190|172.69.79.190]] 19:42, 22 February 2025 (UTC)&lt;br /&gt;
&lt;br /&gt;
::I agree with the second IP on this one! Unless there's a particular comic for which the delay was very important (do you have any in mind?), I don't think this is going to be of much interest to him. --[[User:FaviFake|FaviFake]] ([[User talk:FaviFake|talk]]) 20:11, 22 February 2025 (UTC)&lt;br /&gt;
&lt;br /&gt;
'''Will we get more 5-part sagas? --[[User:CalibansCreations|'''&amp;lt;span style=&amp;quot;color:#ff0000;&amp;quot;&amp;gt;Caliban&amp;lt;/span&amp;gt;''']] ([[User talk:CalibansCreations|talk]]) 11:44, 23 February 2025 (UTC)'''&lt;br /&gt;
:Like [[Choices]], [[The Race]], etc.&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
'''What happened to the transcripts in the JSON interface''' &lt;br /&gt;
:On the [https://xkcd.com/about/ about] page of xkcd there is a description of where:&lt;br /&gt;
 Is there an interface for automated systems to access comics and metadata?&lt;br /&gt;
:Read more here [[Transcript]]. And on this page there is a [[Transcript#End%20of%20transcripts|description]] about how the json info got messed up after [[1608: Hoverboard]] and how they completely ended after [[1677: Contrails]] which had the transcript of [[1674: Adult]].&lt;br /&gt;
:I would like to know if he noticed the messed up order of the transcript and if that was why he choose to end it completely? --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 17:38, 23 February 2025 (UTC)&lt;br /&gt;
&lt;br /&gt;
'''Just wanted to note that some geography comics might be worth asking about ''' &lt;br /&gt;
:I remember browsing pages on this wiki about 6 months ago and noticing that there were many explainations of maps or map like things where editors weren't sure which small islands or small countries since comic drawing is obviously not perfect. I don't remember which comics exactly and don't have time today to investigate, but I figured this observation is worth noting. [[User:XKCD Teaches Science|XKCD Teaches Science]] ([[User talk:XKCD Teaches Science|talk]]) 03:27, 24 February 2025 (UTC)&lt;br /&gt;
&lt;br /&gt;
'''  Machine details ''' &lt;br /&gt;
:Is {{https://xkcd.com/2917|Machine}} going to have a finalized state? If so, when? -- [[User:HyperBirbN3rd|HyperBirbN3rd]]&lt;br /&gt;
&lt;br /&gt;
'''Why was No One Was Hurt replaced?'''&lt;br /&gt;
:No One Was Hurt was a comic that was replaced by Comic 2642: https://www.explainxkcd.com/wiki/index.php/No_One_Was_Hurt, and while it's reasonable to assume that it's probably in response to some...unfortunate irl events, for documentation it would be nice to have an official, confirmed answer [[Special:Contributions/172.68.71.112|172.68.71.112]] 15:44, 24 February 2025 (UTC)&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
Why has there not been any new what if since comet ice? &lt;br /&gt;
.&lt;br /&gt;
::Discuss it and vote --[[Special:Contributions/162.158.41.44|162.158.41.44]] 17:14, 24 February 2025 (UTC)&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
What inspired you to make 1110: Time?&lt;/div&gt;</summary>
		<author><name>141.101.109.166</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=3054:_Scream_Cipher&amp;diff=366280</id>
		<title>3054: Scream Cipher</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=3054:_Scream_Cipher&amp;diff=366280"/>
				<updated>2025-02-21T22:05:48Z</updated>
		
		<summary type="html">&lt;p&gt;141.101.109.166: /* Explanation */&lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;{{comic&lt;br /&gt;
| number    = 3054&lt;br /&gt;
| date      = February 21, 2025&lt;br /&gt;
| title     = Scream Cipher&lt;br /&gt;
| image     = scream_cipher_2x.png&lt;br /&gt;
| imagesize = 287x416px&lt;br /&gt;
| noexpand  = true&lt;br /&gt;
| titletext = AAAAAA A ÃA̧AȂA̦ ǍÅÂÃĀÁȂ AAAAAAA!&lt;br /&gt;
}}&lt;br /&gt;
&lt;br /&gt;
==Explanation==&lt;br /&gt;
{{incomplete|Created by A ÃA̧ȂÁAǍẢÂA̋ ȦÅĀ - Please change this comment when editing this page. Do NOT delete this tag too soon.}}&lt;br /&gt;
A {{w|Cipher}} is a method of encryption, where characters or sometimes words are substituted for other characters in a set pattern, allowing for arbitrary strings to be enciphered using it. The complexity and strength of ciphers varies, from {{w|one-time pads}} and (historically) {{w|enigma machine|Enigma}} as stronger and more complex, to {{w|substitution ciphers}} as some of the weakest and least complex, where each character is simply given a set different symbol to represent it in the cipher.&lt;br /&gt;
&lt;br /&gt;
This comic uses a subtitution cipher, where all the letters of the English Alphabet are represented using the letter A, with different {{w|diacritical marks}} to define the differences. This kind of cipher is often used on a recreational basis by children or casual enthusiasts, the similarity of the letters increasing the obcurity of the content and the skill or technology required for use, but there is also significant impracticality, as not only are substitution ciphers the easiest to break, but also the similarities in the letters do make the cipher hard to read and easy to misread, and the detail in the diacritical marks makes it easy to draw the As incorrectly or ambiguously, potentially leading to [[3003: Sandwich Helix|part of the message being lost.]] This was our experience in the comments section of this very article, where one person implemented translator functions alongside another person crafting a message that failed to translate. However, the logic behind the code is mostly visual similarity, and if attentive to connecting concepts between the american and scream cipher alphabet, it could be quickly learned and translated in a glance.&lt;br /&gt;
&lt;br /&gt;
It's named &amp;quot;Scream Cipher&amp;quot; (as a pun on stream ciphers, commonly used in computing) because the written form of a scream is a long string of As, possibly with some other characters at the end (and often an exclamation point for emphasis), such as &amp;quot;Aaaaaah!&amp;quot; or &amp;quot;Aaaaaaagh!&amp;quot;. The name may or may not be a reference to IBM's {{w|Scream_(cipher)|Scream cipher}} published in 2002.&lt;br /&gt;
&lt;br /&gt;
In the comic, [[Cueball]] texts the cipher for &amp;quot;HELLO&amp;quot;, and [[Megan]] responds with the cipher for &amp;quot;HI&amp;quot;.&lt;br /&gt;
&lt;br /&gt;
The title text deciphers to &amp;quot;AAAAAA A SCARY MONSTER AAAAAA!&amp;quot;&lt;br /&gt;
&lt;br /&gt;
You can translate text to and from Scream Cipher using [https://github.com/matthewpwatkins/scream-cipher/ the Scream Cipher Translator].&lt;br /&gt;
&lt;br /&gt;
Another recent comic featuring all A's was [[2957: A Crossword Puzzle]].&lt;br /&gt;
&lt;br /&gt;
==Worked example==&lt;br /&gt;
&lt;br /&gt;
&amp;lt;!-- If someone knows how to put this in one of those show/hide boxes, please do it --&amp;gt;&lt;br /&gt;
&lt;br /&gt;
Say we want to encode &amp;quot;Scream&amp;quot; in the Scream Cipher. First we would need to split out word into the letters, so S, C, R, E, A, M. &lt;br /&gt;
&lt;br /&gt;
The first letter is S, so if we go to S in the table S is shown to become to Ǎ, C similarly becomes A̧, R becomes Ȃ, E corresponds to Ȃ, A is the main letter so A is unchanged to A, and M becomes Ǎ. If we then write them again in order, we find SCREAM becomes ǍA̧ȂȂAǍ.&lt;br /&gt;
&lt;br /&gt;
To turn cipher text back into normal text, the process is repeated in reverse. To translate A̧ẢA̯A̰ȂȂ, we go to A̧ in the table and find A̧ becomes C. Ả similarly becomes I, A̯ becomes P, A̰ becomes H, Ȃ becomes E, and Ȃ becomes R. If we write the letters in order, we see that A̧ẢA̯A̰ȂȂ becomes CIPHER.&lt;br /&gt;
&lt;br /&gt;
The symmetry of subtitution ciphers is apparent in the example, as in the SCREAM example R becomes Ȃ and E becomes Ȃ, and in the CIPHER example in the opposite direction Ȃ goes back to being R, and Ȃ goes back to being E, though in a different order.&lt;br /&gt;
&lt;br /&gt;
==Table==&lt;br /&gt;
&lt;br /&gt;
The {{w|Unicode}} names of the characters in the cipher are as follows:&lt;br /&gt;
&lt;br /&gt;
{|class=&amp;quot;wikitable&amp;quot;&lt;br /&gt;
! Input !! colspan=2 | Substitution&lt;br /&gt;
|-&lt;br /&gt;
| U+0041 LATIN CAPITAL LETTER A || A || '''U+0041 LATIN CAPITAL LETTER A&lt;br /&gt;
|-&lt;br /&gt;
| U+0042 LATIN CAPITAL LETTER B || Ȧ || '''U+0226 LATIN CAPITAL LETTER A WITH DOT ABOVE&lt;br /&gt;
|-&lt;br /&gt;
| U+0043 LATIN CAPITAL LETTER C || A̧ || U+0041 LATIN CAPITAL LETTER A, U+0327 COMBINING CEDILLA&lt;br /&gt;
|-&lt;br /&gt;
| U+0044 LATIN CAPITAL LETTER D || A̱ || U+0041 LATIN CAPITAL LETTER A, U+0331 COMBINING MACRON BELOW&lt;br /&gt;
|-&lt;br /&gt;
| U+0045 LATIN CAPITAL LETTER E || Ȃ || '''U+00C1 LATIN CAPITAL LETTER A WITH ACUTE&lt;br /&gt;
|-&lt;br /&gt;
| U+0046 LATIN CAPITAL LETTER F || A̮ || U+0041 LATIN CAPITAL LETTER A, U+032E COMBINING BREVE BELOW&lt;br /&gt;
|-&lt;br /&gt;
| U+0047 LATIN CAPITAL LETTER G || A̋ || U+0041 LATIN CAPITAL LETTER A, U+030B COMBINING DOUBLE ACUTE ACCENT&lt;br /&gt;
|-&lt;br /&gt;
| U+0048 LATIN CAPITAL LETTER H || A̰ || U+0041 LATIN CAPITAL LETTER A, U+0330 COMBINING TILDE BELOW&lt;br /&gt;
|-&lt;br /&gt;
| U+0049 LATIN CAPITAL LETTER I || Ả || '''U+1EA2 LATIN CAPITAL LETTER A WITH HOOK ABOVE&lt;br /&gt;
|-&lt;br /&gt;
| U+004A LATIN CAPITAL LETTER J || A̓ || U+0041 LATIN CAPITAL LETTER A, U+0313 COMBINING COMMA ABOVE&lt;br /&gt;
|-&lt;br /&gt;
| U+004B LATIN CAPITAL LETTER K || Ạ || '''U+1EA0 LATIN CAPITAL LETTER A WITH DOT BELOW&lt;br /&gt;
|-&lt;br /&gt;
| U+004C LATIN CAPITAL LETTER L || Ă || '''U+0102 LATIN CAPITAL LETTER A WITH BREVE&lt;br /&gt;
|-&lt;br /&gt;
| U+004D LATIN CAPITAL LETTER M || Ǎ || '''U+01CD LATIN CAPITAL LETTER A WITH CARON&lt;br /&gt;
|-&lt;br /&gt;
| U+004E LATIN CAPITAL LETTER N || Â || '''U+00C2 LATIN CAPITAL LETTER A WITH CIRCUMFLEX&lt;br /&gt;
|-&lt;br /&gt;
| U+004F LATIN CAPITAL LETTER O || Å || '''U+00C5 LATIN CAPITAL LETTER A WITH RING ABOVE&lt;br /&gt;
|-&lt;br /&gt;
| U+0050 LATIN CAPITAL LETTER P || A̯ || U+0041 LATIN CAPITAL LETTER A, U+032F COMBINING INVERTED BREVE BELOW&lt;br /&gt;
|-&lt;br /&gt;
| U+0051 LATIN CAPITAL LETTER Q || A̤ || U+0041 LATIN CAPITAL LETTER A, U+0324 COMBINING DIAERESIS BELOW&lt;br /&gt;
|-&lt;br /&gt;
| U+0052 LATIN CAPITAL LETTER R || Ȃ || '''U+0202 LATIN CAPITAL LETTER A WITH INVERTED BREVE&lt;br /&gt;
|-&lt;br /&gt;
| U+0053 LATIN CAPITAL LETTER S || Ã || '''U+00C3 LATIN CAPITAL LETTER A WITH TILDE&lt;br /&gt;
|-&lt;br /&gt;
| U+0054 LATIN CAPITAL LETTER T || Ā || '''U+0100 LATIN CAPITAL LETTER A WITH MACRON&lt;br /&gt;
|-&lt;br /&gt;
| U+0055 LATIN CAPITAL LETTER U || Ä || '''U+00C4 LATIN CAPITAL LETTER A WITH DIAERESIS&lt;br /&gt;
|-&lt;br /&gt;
| U+0056 LATIN CAPITAL LETTER V || À || '''U+00C0 LATIN CAPITAL LETTER A WITH GRAVE&lt;br /&gt;
|-&lt;br /&gt;
| U+0057 LATIN CAPITAL LETTER W || Ȁ || '''U+0200 LATIN CAPITAL LETTER A WITH DOUBLE GRAVE&lt;br /&gt;
|-&lt;br /&gt;
| U+0058 LATIN CAPITAL LETTER X || A̽ || U+0041 LATIN CAPITAL LETTER A, U+033D COMBINING X ABOVE&lt;br /&gt;
|-&lt;br /&gt;
| U+0059 LATIN CAPITAL LETTER Y || A̦ || U+0041 LATIN CAPITAL LETTER A, U+0326 COMBINING COMMA BELOW&lt;br /&gt;
|-&lt;br /&gt;
| U+005A LATIN CAPITAL LETTER Z || Ⱥ || '''U+023A LATIN CAPITAL LETTER A WITH STROKE&lt;br /&gt;
|}&lt;br /&gt;
&lt;br /&gt;
==Transcript==&lt;br /&gt;
{{incomplete transcript|Do NOT delete this tag too soon.}}&lt;br /&gt;
&lt;br /&gt;
:[Top of the panel has 26 letters of the alphabet, each followed by a hyphen and the letter &amp;quot;A&amp;quot; with a unique diacritical mark for each. &amp;quot;A - A&amp;quot; at the top is an exception, where the latter doesn't have a diacritic.]&lt;br /&gt;
:{|&lt;br /&gt;
|A - A&lt;br /&gt;
|-&lt;br /&gt;
|B - Ȧ&lt;br /&gt;
|G - A̋&lt;br /&gt;
|L - Ă&lt;br /&gt;
|Q - A̤&lt;br /&gt;
|V - À&lt;br /&gt;
|-&lt;br /&gt;
|C - A̧&lt;br /&gt;
|H - A̰&lt;br /&gt;
|M - Ǎ&lt;br /&gt;
|R - Ȃ&lt;br /&gt;
|W - Ȁ&lt;br /&gt;
|-&lt;br /&gt;
|D - A̱&lt;br /&gt;
|I - Ả&lt;br /&gt;
|N - Â&lt;br /&gt;
|S - Ã&lt;br /&gt;
|X - A̽&lt;br /&gt;
|-&lt;br /&gt;
|E - Á&lt;br /&gt;
|J - A̓&lt;br /&gt;
|O - Å&lt;br /&gt;
|T - Ā&lt;br /&gt;
|Y - A̦&lt;br /&gt;
|-&lt;br /&gt;
|F - A̮&lt;br /&gt;
|K - Ạ&lt;br /&gt;
|P - A̯&lt;br /&gt;
|U - Ä&lt;br /&gt;
|Z - Ⱥ&lt;br /&gt;
|}&lt;br /&gt;
:[Cueball and Megan typing on their phones, Cueball with two hands and Megan with one hand.]&lt;br /&gt;
:Cueball's phone: A̰ÁĂĂÅ&lt;br /&gt;
:Megan's phone: A̰Ả&lt;br /&gt;
&lt;br /&gt;
:[Caption below the panel:]&lt;br /&gt;
:In the ''Scream Cipher'', messages consist of all As, with different letters distinguished using diacritics.&lt;br /&gt;
&lt;br /&gt;
{{comic discussion}}&lt;br /&gt;
&lt;br /&gt;
[[Category:Comics featuring Cueball]]&lt;br /&gt;
[[Category:Comics featuring Megan]]&lt;br /&gt;
[[Category:Language]]&lt;br /&gt;
[[Category:Cryptography]]&lt;/div&gt;</summary>
		<author><name>141.101.109.166</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=3050:_Atom&amp;diff=365420</id>
		<title>3050: Atom</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=3050:_Atom&amp;diff=365420"/>
				<updated>2025-02-13T00:03:46Z</updated>
		
		<summary type="html">&lt;p&gt;141.101.109.166: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;{{comic&lt;br /&gt;
| number    = 3050&lt;br /&gt;
| date      = February 12, 2025&lt;br /&gt;
| title     = Atom&lt;br /&gt;
| image     = atom_2x.png&lt;br /&gt;
| imagesize = 281x385px&lt;br /&gt;
| noexpand  = true&lt;br /&gt;
| titletext = What's weirder is that muons turned out to be INCREDIBLY cute.&lt;br /&gt;
}}&lt;br /&gt;
&lt;br /&gt;
==Explanation==&lt;br /&gt;
{{incomplete|Created by a  wobbly and wet BOT - Please change this comment when editing this page. Do NOT delete this tag too soon.}}&lt;br /&gt;
Atoms are typically very, very small, and [[1490: Atoms|generally]] cannot be seen with the naked eye nor individually discernable with human hands (despite almost all things that they can touch, and even themselves, being ''made'' of atoms). The humor here comes from the fact that atoms, normally intangible in a singular form, have been given a large physical presence that apparently feels gross and nonsensical. The characters in the comic have found this out using a so-called &amp;quot;quantum expander device&amp;quot; which would be a huge advance in modern physics (and possibly quite dangerous) if it existed, but unfortunately/fortunately it does not. &lt;br /&gt;
&lt;br /&gt;
Although electrons are often depicted as orbiting an atomic nucleus very similarly to how planets orbit the Sun, this is an extremely simplistic model of how the electrons are positioned. Students are often taught a succession of more complex models over several years of schooling. In reality, [[2100: Models of the Atom|current understanding of]] the behavior of electrons is ruled by quantum mechanics and {{w|Uncertainty_principle|Heisenberg’s Uncertainty Principle}}. An electron doesn't have a single exact location relative to the nucleus; rather, its location is probabilistic. It can be considered to be &amp;quot;smeared out&amp;quot;, with specific locations in space having higher or lower concentrations. This is often visualized to be similar to how a meteorological cloud can be dense or thin. It's often depicted by showing the shapes of the electron density patterns with varying intensities of color, or densely-packed dots vs. spread-out dots. This is sometimes referred to as the &amp;quot;electron cloud model&amp;quot;, though electrons aren't ''really'' composed of tiny droplets. A cloud in the sky contains water, [https://gpm.nasa.gov/resources/faq/what-are-clouds-made-are-they-more-likely-form-polluted-air-or-pristine-air] and is often assumed to be wet, but could be anything from vapour to ice-crystals. The feel of wetness is also a lot more complicated than we might think. Everybody knows what something wet feels like,{{Citation needed}} but there are no &amp;quot;wetness&amp;quot;-detecting cells in the skin. Apparently the brain uses various clues like temperature and pressure, along with past experiences, to determine when something feels &amp;quot;wet&amp;quot;. [https://issuu.com/university_of_southampton/docs/reaction_magazine_winter_2021/s/14454287]&lt;br /&gt;
&lt;br /&gt;
Scientists generally wear latex gloves when touching certain subjects of study, certainly those that are expected to be damp, and perhaps [[Ponytail]] and [[Cueball]] should be doing that here.&lt;br /&gt;
&lt;br /&gt;
The title text expands on this, claiming that muons, a type of subatomic particle, apparently are &amp;quot;cute&amp;quot; despite ordinarily being subatomic particles with a mean lifetime of 2.2 microseconds, [[3043: Muons|give or take]]. Muons might be considered cute because they're small — like electrons and tau particles, they are considered to be point phenomena at the quantum level with no practical physical size (at or below {{w|https://en.m.wikipedia.org/wiki/Planck units#Planck length|subatomic Planck-scale}}), although ''possibly'' that (and the time they last) changes as a function of the quantum expander being applied to them.&lt;br /&gt;
&lt;br /&gt;
==Transcript==&lt;br /&gt;
{{incomplete transcript|Do NOT delete this tag too soon.}}&lt;br /&gt;
&lt;br /&gt;
:[Cueball is holding in one hand, away from himself, an atom approximately the size of his head with shaky lines drawn around the atom. Ponytail has her hand near the atom and her other hand above her chin. Hairy stands to the right of Ponytail.]&lt;br /&gt;
:Cueball: Ugh, the electron cloud is so weird and wobbly! I hate it!&lt;br /&gt;
:Ponytail: Why is it so wet? How can it even ''be'' wet?&lt;br /&gt;
:Hairy: I don't want to do physics anymore.&lt;br /&gt;
&lt;br /&gt;
:[Caption below the panel:]&lt;br /&gt;
:When our lab was building the quantum expander device, we didn't expect our first discovery to be &amp;quot;atoms are really gross.&amp;quot;&lt;br /&gt;
&lt;br /&gt;
{{comic discussion}}&lt;br /&gt;
&lt;br /&gt;
[[Category:Comics featuring Cueball]]&lt;br /&gt;
[[Category:Comics featuring Ponytail]]&lt;br /&gt;
[[Category:Comics featuring Hairy]]&lt;br /&gt;
[[Category:Physics]]&lt;br /&gt;
[[Category:Chemistry]]&lt;/div&gt;</summary>
		<author><name>141.101.109.166</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=3024:_METAR&amp;diff=359494</id>
		<title>3024: METAR</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=3024:_METAR&amp;diff=359494"/>
				<updated>2024-12-14T16:18:18Z</updated>
		
		<summary type="html">&lt;p&gt;141.101.109.166: /* Explanation */&lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;{{comic&lt;br /&gt;
| number    = 3024&lt;br /&gt;
| date      = December 13, 2024&lt;br /&gt;
| title     = METAR&lt;br /&gt;
| image     = metar_2x.png&lt;br /&gt;
| imagesize = 640x360px&lt;br /&gt;
| noexpand  = true&lt;br /&gt;
| titletext = In the aviation world, they don't use AM/PM times. Instead, all times are assumed to be AM unless they're labeled NOTAM.&lt;br /&gt;
}}&lt;br /&gt;
&lt;br /&gt;
==Explanation==&lt;br /&gt;
{{incomplete|Created by a BOT WITH NO SIGNIFICANT OTHER :( (OTHER THAN AN A380). Do NOT delete this tag too soon.}}&lt;br /&gt;
&lt;br /&gt;
In aviation, the {{w|METAR}} (Meteorological Aerodrome Report) is used to give pilots a brief overview of the current meteorological conditions at the airport. The METAR follows a specific structure and makes heavy usage of abbreviations, which makes it hard to read for anyone not familiar with it. The comic makes fun of that by assuming meaning based on what non-aviation people might think the different elements of the METAR report may represent. The METAR in the comic is fairly alarming, describing dangerously fast winds, a possible tornado, freezing volcanic ash (in New York!), lightning, and impossibly high atmospheric pressure.&lt;br /&gt;
&lt;br /&gt;
{| class=&amp;quot;wikitable&amp;quot;&lt;br /&gt;
|-&lt;br /&gt;
! Code !! Real Meaning !! According to the comic&lt;br /&gt;
|-&lt;br /&gt;
| METAR&lt;br /&gt;
| Type: Meteorological Aerodrome Report&lt;br /&gt;
| The comic assumes that this is just a spelling error and it should be &amp;quot;meter&amp;quot;&lt;br /&gt;
|-&lt;br /&gt;
| KNYC&lt;br /&gt;
| Station ID: 4 character identifier; for an airport, this would be the ICAO code. In this instance the identifier represents the automated weather station at Belvedere Castle in Central Park, NYC. Airport, weather, and radio station call signs share a common heritage.&lt;br /&gt;
| &amp;quot;Station ID&amp;quot;, which is actually correct, although most people unfamiliar with METAR-reporting stations may presume this is a TV or radio broadcaster's registered identification. &lt;br /&gt;
|-&lt;br /&gt;
| 251600Z&lt;br /&gt;
| Time of observation: 25th day of the month at 4 PM UTC. Z is not part of the time, but simply global shorthand for {{w|Military time zone|&amp;quot;Zulu&amp;quot; time}}, i.e. {{w|Coordinated Universal Time|UTC}}. Normally most stations would report at a particular time every hour, in this particular case either 15:51 or 16:51 would apply, but more frequent reports are made during unusual and rapidly changing weather events (as may be the situation, in this case).&lt;br /&gt;
| Misreading the &amp;quot;Z&amp;quot; as a 2, resulting in a nonsensical time. Hours greater than 24 are sometimes used to indicate a time after midnight, e.g., in Japan 17~25h means from 5 P.M. to 1 A.M. the following day. A normal METAR does not use more than 24 hours, instead incrementing the day, so 25 hours further adds to the nonsensical nature of the interpretation.&lt;br /&gt;
|-&lt;br /&gt;
| 18035G45KT&lt;br /&gt;
| Wind direction and speed: Wind direction 180° (directly from the south, degrees based on 0°=magnetic north), speed 35 knots, gusting to 45 knots. This is quite stormy weather.&lt;br /&gt;
| Instead of interpreting the first 5 digits as direction and speed, it is assumed that it is one big number and the G45 stands for the time span in which this was observed with &amp;quot;G&amp;quot; standing for &amp;quot;good&amp;quot;. 18,035 knots is an unrealistically high wind speed, faster than orbital velocity; the {{w|jet stream}} typically contains the highest winds on Earth, and may reach about 250 knots.&lt;br /&gt;
|-&lt;br /&gt;
| 6SM&lt;br /&gt;
| In weather reports related to aviation, &amp;quot;6SM&amp;quot; stands for 6 statute miles of visibility, meaning that objects can be seen clearly up to 6 miles away.&amp;lt;ref&amp;gt;https://weather.cod.edu/notes/metar.html#:~:text=6SM%2DVisibility,SM)%20up%20to%2010%20SM.&amp;lt;/ref&amp;gt; This indicates clear enough weather to fly without instruments; the value has a max range of 10SM.&lt;br /&gt;
| The comic interprets &amp;quot;6SM&amp;quot; to humorously mean a clothing size: &amp;quot;Size '''6 Sm'''all&amp;quot;.&lt;br /&gt;
|-&lt;br /&gt;
| VCFCFZVA&lt;br /&gt;
| In the vicinity (VC): funnel cloud (FC) and freezing (FZ) volcanic ash (VA). This sounds somewhat unusual for New York City.&lt;br /&gt;
| A riff on the repeated letters which give off the impression the string is constructed by random keypresses on the keyboard, as exemplified by a [[1689: My Friend Catherine|cat on the keyboard]]. There is a long history of this problem, as well as [http://bitboost.com/pawsense/ attempted solutions].&lt;br /&gt;
This string may or may not actually look like the pattern of characters that a walking cat could produce (and be reliably detected). All the letters are in a cluster at the lower left of the (QWERTY) keyboard, with some adjacently paired characters perhaps indicative of stepping on multiple keys and other neighbouring keys having been stepped over, not uncommon of an oblivious feline wandering across your desk. But the repeated cluster of &amp;quot;CFCF&amp;quot;, and other implied paw-press events, seem less likely to emerge even from a rapid quadrupedal gait. A more casual stroll would likely also create single-character duplications, unless the keyboard repeat delay was set unnaturally high.&lt;br /&gt;
|-&lt;br /&gt;
| +BLUP&lt;br /&gt;
| Heavy (+) blowing (BL) unknown precipitation (UP)&lt;br /&gt;
| Riffing on the fact that it looks like an onomatopoetic word&lt;br /&gt;
|-&lt;br /&gt;
| NOSIG&lt;br /&gt;
| No significant change is expected to the reported conditions within the next 2 hours&lt;br /&gt;
| The comic assumes that the transmitter of the METAR report wants the receivers to know that they do not have a significant other, which the comic finds sad. The observer could be trying to abuse the METAR report as a dating platform.&lt;br /&gt;
|-&lt;br /&gt;
| LTG OHD&lt;br /&gt;
| Lightning overhead &lt;br /&gt;
| OHD is interpreted as &amp;quot;overheard&amp;quot; instead of &amp;quot;overhead&amp;quot;, indicating that they did not observe it themselves and instead just overheard people talking about it.&lt;br /&gt;
|-&lt;br /&gt;
| A3808&lt;br /&gt;
| Altimeter setting: (calculated) air pressure at {{w|Mean_sea_level|mean sea level}} at the airport is 38.08.  The value of 38.08 inHg is extremely high. The standard atmospheric pressure used in aviation is 29.92 inHg; the highest recorded surface pressure on Earth was 32.01 {{w|Inch_of_mercury|inches of mercury (inHg)}}&amp;lt;ref&amp;gt;https://learn.weatherstem.com/modules/learn/lessons/125/18.html&amp;lt;/ref&amp;gt; (&amp;quot;A&amp;quot; for inHg, used primarily in USA, Canada and Japan; &amp;quot;Q&amp;quot; would indicate a value in hPa). This is used to adjust the altimeter in the aircraft to the local air pressure, instead of using the standard setting used in higher air spaces.&lt;br /&gt;
| The comic says that the observer saw an {{w|Airbus_A380|Airbus A380-800}}, a very large passenger plane. Note: The {{w|List_of_ICAO_aircraft_type_designators|ICAO aircraft type code}} for the Airbus A380-800 is A388 and not A3808.&lt;br /&gt;
|-&lt;br /&gt;
| RMK&lt;br /&gt;
| Beginning of the section with remarks&lt;br /&gt;
| Remarkable. A comment about the A380.&lt;br /&gt;
|-&lt;br /&gt;
| AO2&lt;br /&gt;
| The weather station is automated (A) and has a precipitation discriminator (O2), which can tell the difference between liquid and frozen precipitation.&lt;br /&gt;
| A reference to the {{w|fan fiction|fanfic}} site [https://archiveofourown.org/ Archive of Our Own], often abbreviated as AO3. It's nonsensical to describe this site as having a precipitation discriminator.&lt;br /&gt;
|-&lt;br /&gt;
| SLP130=&lt;br /&gt;
| {{w|Sea_level_pressure|Sea-level pressure}} is 1013.0 hPa (approx. 29.91 inHg). The equal sign signifies the end of the METAR.&lt;br /&gt;
| &amp;quot;SLP&amp;quot; interpreted as abbreviation for sleepy, the numbers as a time, and the = sign as &amp;quot;around&amp;quot; (maybe confused with ≈)&lt;br /&gt;
|-&lt;br /&gt;
| NOTAM (title text)&lt;br /&gt;
| Not part of a METAR report, but instead another aviation abbreviation. It stands for {{w|NOTAM|Notice to Air Missions}} (previously Notice to Airmen).&lt;br /&gt;
| Parsed as &amp;quot;not A.M.&amp;quot;, indicating that a given time is to be interpreted as P.M. While AM and PM are indeed not used in aviation, as the comic says, they use a 24-hour clock system, not an &amp;quot;A.M.-by-default&amp;quot; 12-hour clock system.&lt;br /&gt;
|}&lt;br /&gt;
&lt;br /&gt;
==Transcript==&lt;br /&gt;
{{incomplete transcript|Do NOT delete this tag too soon.}}&lt;br /&gt;
&lt;br /&gt;
:Decoding a METAR report:&lt;br /&gt;
&lt;br /&gt;
:[A METAR report is shown with annotations. The report is:]&lt;br /&gt;
&lt;br /&gt;
:&amp;lt;code&amp;gt;METAR KNYC 251600Z 18035G45KT 6SM VCFCFZVA +BLUP NOSIG LTG OHD A3808 RMK A02 SPL130=&amp;lt;/code&amp;gt;&lt;br /&gt;
&lt;br /&gt;
:[The annotations are:]&lt;br /&gt;
&lt;br /&gt;
:* &amp;lt;code&amp;gt;METAR&amp;lt;/code&amp;gt; &amp;quot;METER&amp;quot; (Usually misspelled)&lt;br /&gt;
:* &amp;lt;code&amp;gt;KNYC&amp;lt;/code&amp;gt; Station ID&lt;br /&gt;
:* &amp;lt;code&amp;gt;251600Z&amp;lt;/code&amp;gt; Time (25:16:002)&lt;br /&gt;
:* &amp;lt;code&amp;gt;18035G45KT&amp;lt;/code&amp;gt; Wind speed has been 18,035 knots for a good 45 minutes now&lt;br /&gt;
:* &amp;lt;code&amp;gt;6SM&amp;lt;/code&amp;gt; Observer is a size 6 small&lt;br /&gt;
:* &amp;lt;code&amp;gt;VCFCFZVA&amp;lt;/code&amp;gt; Sorry, the station cat walked on the keyboard&lt;br /&gt;
:* &amp;lt;code&amp;gt;+BLUP&amp;lt;/code&amp;gt; Weird noise the sky made earlier&lt;br /&gt;
:* &amp;lt;code&amp;gt;NOSIG&amp;lt;/code&amp;gt; Observer has no significant other :(&lt;br /&gt;
:* &amp;lt;code&amp;gt;LTG OHD&amp;lt;/code&amp;gt; We overheard someone saying there was lightning&lt;br /&gt;
:* &amp;lt;code&amp;gt;A3808&amp;lt;/code&amp;gt; Hey look, an Airbus A380-800!&lt;br /&gt;
:* &amp;lt;code&amp;gt;RMK&amp;lt;/code&amp;gt; Remarkable!&lt;br /&gt;
:* &amp;lt;code&amp;gt;A02&amp;lt;/code&amp;gt; Fanfic Archive equipped with a precipitation sensor&lt;br /&gt;
:* &amp;lt;code&amp;gt;SLP130=&amp;lt;/code&amp;gt; Observer got sleepy around 1:30&lt;br /&gt;
&lt;br /&gt;
==References==&lt;br /&gt;
{{reflist}}&lt;br /&gt;
[https://e6bx.com/metar-decoder/ Metar Decoder]&lt;br /&gt;
&lt;br /&gt;
{{comic discussion}}&lt;br /&gt;
&lt;br /&gt;
[[Category:Weather]]&lt;br /&gt;
[[Category:Aviation]]&lt;br /&gt;
[[Category:Emoji]]&lt;/div&gt;</summary>
		<author><name>141.101.109.166</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=3001:_Temperature_Scales&amp;diff=355047</id>
		<title>3001: Temperature Scales</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=3001:_Temperature_Scales&amp;diff=355047"/>
				<updated>2024-10-29T21:53:06Z</updated>
		
		<summary type="html">&lt;p&gt;141.101.109.166: /* Explanation */ Subject-verb agreement&lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;{{comic&lt;br /&gt;
| number    = 3001&lt;br /&gt;
| date      = October 21, 2024&lt;br /&gt;
| title     = Temperature Scales&lt;br /&gt;
| image     = temperature_scales_2x.png&lt;br /&gt;
| imagesize = 740x535px&lt;br /&gt;
| noexpand  = true&lt;br /&gt;
| titletext = In my new scale, °X, 0 is Earths' record lowest surface temperature, 50 is the global average, and 100 is the record highest, with a linear scale between each point and adjustment every year as needed.&lt;br /&gt;
}}&lt;br /&gt;
&lt;br /&gt;
==Explanation==&lt;br /&gt;
{{incomplete|Created by a TOTALLY CONFORMING TEMPERATURE SYSTEM. Do NOT delete this tag too soon.}}&lt;br /&gt;
&lt;br /&gt;
Since the invention of the {{w|thermometer}}, a number of different {{w|temperature}} scales have been proposed. In modern times, most of the world uses the 1745 {{w|Celsius}} scale for everyday temperature measurements. A small number of countries (the USA and {{w|Territories of the United States|its territories}}, the Bahamas, Belize, the Cayman Islands, Liberia, and Palau) retain the {{w|Imperial units|imperial system}} (or the related {{w|United States customary units|US customary system}}), which uses the 1724 {{w|Fahrenheit}} scale. The other widely used temperature scale is the 1848 {{w|Kelvin}} scale, which uses the same degrees as Celsius, but is rooted at {{w|absolute zero}}, making it both useful in scientific calculations and easy to convert to and from Celsius (which, along with degrees Fahrenheit, is now defined relative to kelvins.) The Kelvin scale has been part of the widely adopted official {{w|metric system}} since 1954. Even in countries that use Fahrenheit, scientific measurements are usually made in degrees Celsius or kelvins.&lt;br /&gt;
&lt;br /&gt;
The comic compares these scales, and a number of others, on [[Randall]]'s scale of &amp;quot;cursedness.&amp;quot; The joke is highlighting how different the temperature scales are, and how impractical most of them are. All of the listed scales (except Randall's new °X scale defined in the title text) are real, but most are obsolete. Please see also [[1923: Felsius]], a combination of degrees Fahrenheit and Celsius.&lt;br /&gt;
&lt;br /&gt;
{| class=wikitable&lt;br /&gt;
! scope=&amp;quot;col&amp;quot; | Unit&lt;br /&gt;
! scope=&amp;quot;col&amp;quot; | Water freezes&lt;br /&gt;
! scope=&amp;quot;col&amp;quot; | Water boils&lt;br /&gt;
! scope=&amp;quot;col&amp;quot; | Notes&lt;br /&gt;
! scope=&amp;quot;col&amp;quot; | Cursedness&lt;br /&gt;
! scope=&amp;quot;col&amp;quot; | Explanation&lt;br /&gt;
|-&lt;br /&gt;
| {{w|Celsius}} || 0 || 100 || Used in most of the world || 2/10 || The Celsius (°C) scale, also known as &amp;quot;centigrade&amp;quot;, was devised by Swedish astronomer {{w|Anders Celsius}} in 1742 and revised in 1745, a year after his death. 0°C represents the freezing point of water and 100°C represents the boiling point, both under {{w|standard atmospheric pressure}}. The Celsius scale is now defined in terms of kelvin. By the given &amp;quot;cursedness,&amp;quot; it is regarded as one of the least problematic temperature scales.&lt;br /&gt;
|-&lt;br /&gt;
| {{w|Kelvin}} || 273.15 || 373.15 || 0K is absolute zero || 2/10 || Kelvins (plural with a lowercase 'k' as a temperature unit, like meters, ohms, watts, and amps; or as the symbol 'K', without the degrees symbol '°', unlike most other such units) are a unit of temperature devised by {{w|Lord Kelvin}} in 1848. They use the same degrees as Celsius do, but shifted by 273.15 to set absolute zero at 0K (based on the {{w|Boltzmann constant}}.)&lt;br /&gt;
&amp;lt;center&amp;gt;Celsius = kelvin – 273.15.&amp;lt;/center&amp;gt;&lt;br /&gt;
&amp;lt;center&amp;gt;kelvin = Celsius + 273.15.&amp;lt;/center&amp;gt;&lt;br /&gt;
While kelvins are very useful for calculations in {{w|thermodynamics}} and material physics, they can be unintuitive to laypersons.&lt;br /&gt;
|-&lt;br /&gt;
| {{w|Fahrenheit}} || 32 || 212 || Outdoors in most places is between 0–100 || 3/10 || Fahrenheit (°F) is officially used in a few countries and informally in several others. It originated in a time when factors of 360 were favored in science over powers of ten, which is why the freezing and boiling points of water are set 180° apart. Devised around 1724, {{w|Daniel Fahrenheit}} chose not to base 0° on the freezing point of water, instead originally setting it at the coldest temperature he could achieve: the freezing point of an {{w|ammonium chloride}} {{w|brine}} solution.&lt;br /&gt;
&amp;lt;center&amp;gt;Celsius = (Fahrenheit – 32) × 5/9.&amp;lt;/center&amp;gt;&lt;br /&gt;
&amp;lt;center&amp;gt;Fahrenheit = Celsius × 9/5 + 32.&amp;lt;/center&amp;gt;&lt;br /&gt;
Although those reference points are now considered arbitrary and outdated by modern scholars, the scale gained popularity in Anglophone countries, possibly because everyday weather conditions usually fall handily all across the range 0–100°F. 100°F is {{w|Human body temperature#Historical understanding|close to normal human body temperature}} (the original intent was to set 90°F as exactly this, 90 being a quarter of 360). The Fahrenheit scale remains officially used only in the U.S., its territories, the Bahamas, Belize, the Cayman Islands, Liberia and Palau.&lt;br /&gt;
|-&lt;br /&gt;
| {{w|Réaumur scale|Réaumur}} || 0 || 80 || Like Celsius, but with 80 instead of 100 || 3/8 || Abbreviated as °Ré, this system devised by {{w|René Antoine Ferchault de Réaumur}} in 1730 was used in some places until the early 20th century, mostly for cheese-making.&lt;br /&gt;
&amp;lt;center&amp;gt;Celsius = Réaumur / 0.8.&amp;lt;/center&amp;gt;&lt;br /&gt;
&amp;lt;center&amp;gt;Réaumur = Celsius × 0.8.&amp;lt;/center&amp;gt;&lt;br /&gt;
The rating (3/8) is a joke on the boiling point of water in this system being 80 instead of 100 as it is in the Celsius scale; converting this to an out-of-ten scale would give 3.75/10, labeling it as more cursed than Fahrenheit but less so than Rømer.&lt;br /&gt;
|-&lt;br /&gt;
| {{w|Rømer scale|Rømer}} || 7.5 || 60 || Fahrenheit precursor with similarly random design || 4/10 || Abbreviated as °Rø, this scale was created by the Danish astronomer {{w|Ole Rømer}} around 1702. Much like Fahrenheit, it originally used the freezing point of ammonium chloride brine as the benchmark for 0°, and the scale is built with factors of 360 in mind with the boiling point of pure water at 60°. Like the Fahrenheit scale, the freezing point of pure water was not originally considered significant by Rømer, but the scale was later updated to give the value of 7.5 at this point.&lt;br /&gt;
&amp;lt;center&amp;gt;Celsius = (Rømer – 7.5) × 40/21.&amp;lt;/center&amp;gt;&lt;br /&gt;
&amp;lt;center&amp;gt;Rømer = Celsius × 21/40 + 7.5.&amp;lt;/center&amp;gt;&lt;br /&gt;
The Rømer scale is  considered the predecessor of both the Celsius and Fahrenheit scales, because Réaumur was inspired by Rømer's scale, Celsius based his work on Réaumur and Fahrenheit specifically designed his scale with more divisions than Rømer's to reduce the necessity for fractions.&lt;br /&gt;
|-&lt;br /&gt;
| {{w|Rankine scale|Rankine}} || 491.7 || 671.7 || Fahrenheit, but with 0°F [''sic;'' should be 0°Ra] set to absolute zero  || 6/10 || The Rankine scale (°R or °Ra), devised in 1859 by {{w|William Rankine}}, is to that of Fahrenheit what the Kelvin scale is to the Celsius, an absolute (rather than a relative) scale. The scale is mostly obsolete, but is still occasionally used in legacy industrial operations where absolute temperature scales are required. It is described as more cursed than the otherwise identical Fahrenheit scale, despite being rooted at a more universal zero point.&lt;br /&gt;
&amp;lt;center&amp;gt;Celsius = (Rankine – 491.67) × 5/9.&amp;lt;/center&amp;gt;&lt;br /&gt;
&amp;lt;center&amp;gt;Rankine = (Celsius + 273.15) × 9/5.&amp;lt;/center&amp;gt;&lt;br /&gt;
Another comic, [[2292: Thermometer]], expresses disdain for this scale.&lt;br /&gt;
|-&lt;br /&gt;
| {{w|Newton scale|Newton}} || 0 || 33-ish || Poorly defined, with reference points like &amp;quot;the hottest water you can hold your hand in&amp;quot;{{acn}} || 7-ish/10 || The famous scientist and mathematician {{w|Isaac Newton}} published this scale in 1701, which was referred to by the the °N symbol. Sadly, the degrees of temperature specified do not correlate exactly with amounts of {{w|heat}} because his scale is nonlinear. His scale used three fixed-points: 0ºN, the temperature of air when water begins to freeze, 12ºN, the heat of blood in the human body, 34ºN, rapidly boiling water.[https://www.whipplemuseum.cam.ac.uk/explore-whipple-collections/meteorology/early-thermometers-and-temperature-scales] Therefore:&lt;br /&gt;
&amp;lt;center&amp;gt;Celsius = 37 × Newton / 12 if Newton ≤ 12;&amp;lt;br/&amp;gt;or 63 × (Newton – 12) / 22 + 37 if Newton &amp;gt; 12.&amp;lt;/center&amp;gt;&lt;br /&gt;
&amp;lt;center&amp;gt;Newton = 12 × Celsius / 37 if Celsius ≤ 37;&amp;lt;br/&amp;gt;or 22 × (Celsius – 37) / 63 + 12 if Celsius &amp;gt; 37.&amp;lt;/center&amp;gt;&lt;br /&gt;
Very few scientists other than Newton ever used this scale,{{citation needed}} but it did appear on commercial thermometers around 1758.[https://www.scienceandsociety.co.uk/results.asp?image=10413117&amp;amp;wwwflag=&amp;amp;imagepos=43] The cursedness rating (7-ish/10) is a joke about the vagueness of the scale's definition.&lt;br /&gt;
|-&lt;br /&gt;
| {{w|Wedgwood scale|Wedgwood}} || –8 || –6.7 || Intended for comparing the melting points of metals, all of which it was very wrong about || 9/10 || Created by the potter {{w|Josiah Wedgwood}} in 1782, the '°W' scale was based on the shrinking of clay when heated above red heat, but was found to be very inconsistent.&lt;br /&gt;
&amp;lt;center&amp;gt;Celsius = (Wedgwood + 8) × 100/1.3.&amp;lt;/center&amp;gt;&lt;br /&gt;
&amp;lt;center&amp;gt;Wedgwood = (Celsius × 1.3/100) – 8.&amp;lt;/center&amp;gt;&lt;br /&gt;
The comic has a typo, as the scale is called Wedgwood, without the second 'e'. &lt;br /&gt;
|-&lt;br /&gt;
| Galen || –4? || 4?? || Runs from –4 (cold) to 4 (hot). 0 is &amp;quot;normal&amp;quot;(?) || 4/–4 || The Greek physician {{w|Galen}} suggested a &amp;quot;neutral&amp;quot; temperature around 180 A.D.,[https://www.loebclassics.com/view/galen-temperaments/2020/pb_LCL546.3.xml] when he was a prominent physician in the {{w|Roman Empire}}. Created by mixing equal parts of boiling water and ice, on either side of this neutral point he described four degrees of heat and four degrees of cold. Assuming his extremes were those points, Galen's scale is also nonlinear:&lt;br /&gt;
&amp;lt;center&amp;gt;Celsius = 22 × (Galen + 4) / 4 if Galen ≤ 0;&amp;lt;br/&amp;gt;or 78 × Galen / 4 + 22 if Galen &amp;gt; 0.&amp;lt;/center&amp;gt;&lt;br /&gt;
&amp;lt;center&amp;gt;Galen = 4 × Celsius / 22 – 4 if Celsius ≤ 22;&amp;lt;br/&amp;gt;or 4 × (Celsius – 22) / 78 if Celsius &amp;gt; 22.&amp;lt;/center&amp;gt;&lt;br /&gt;
This range from +4 to –4 is humorously used as its rating, implying –100% cursedness. Technically this makes it the least cursed of all the listed scales, but the idea of negative cursedness, and cursedness itself, is not clear. There is no standard modern abbreviation for Galen's scale.&lt;br /&gt;
|-&lt;br /&gt;
| {{w|Celsius#History|''Real'' Celsius}} || 100 || 0 || In Anders Celsius's original 1742 specification, bigger numbers are ''colder''; others later flipped it || 10/0 || Most scales' temperatures can be indefinitely large, but have an absolute minimum temperature. By starting at a maximum value and counting down, this scale is indeed cursed, as nearly all possible temperatures through 1.42×10&amp;lt;sup&amp;gt;32&amp;lt;/sup&amp;gt;K, the maximum attainable physical temperature,[https://doi.org/10.4236/jamp.2024.1210198] will be negative in this implementation. The cursedness rating (10/0) is a joke on the scale &amp;quot;flipping&amp;quot; the fixed points of modern Celsius. Division by zero is strictly undefined (see [[2295: Garbage Math]]) and may be interpreted in a number of counter-intuitive ways.&lt;br /&gt;
&amp;lt;center&amp;gt;Celsius = 100 – real_Celsius.&amp;lt;/center&amp;gt;&lt;br /&gt;
&amp;lt;center&amp;gt;real_Celsius = 100 – Celsius.&amp;lt;/center&amp;gt;&lt;br /&gt;
The original logic was that zero could be easily calibrated to the height of a {{w|Millimetre of mercury|column of mercury}} at the temperature of boiling water, and further measurements then made of the amount it ''reduced'' in height under cooler conditions. This orientation survives in the historic {{w|Delisle scale}} devised in 1732 by French astronomer {{w|Joseph-Nicolas Delisle}}, which arguably inspired the Celsius scale. The scale originally used by Professor Celsius was changed, to more or less the form already described above, after his death in 1745. Delisle's scale was never reversed.&lt;br /&gt;
|-&lt;br /&gt;
| [https://physics.stackexchange.com/questions/459851/john-daltons-temperature-scale#459863 Dalton] || 0 || 100 || A nonlinear scale; 0°C and 100°C are 0 and 100 Dalton, but 50°C is 53.9 Dalton || 53.9/50 || {{w|John Dalton}} proposed a logarithmic temperature scale in 1802 during his work on what became {{w|Charles's Law}}. The scale is defined so that absolute zero is at negative infinity, with the exponent chosen to match the Celsius scale at 0 and 100:&lt;br /&gt;
&amp;lt;center&amp;gt;Celsius = 273.15 × ''e''&amp;lt;sup&amp;gt;(Dalton / 320.55)&amp;lt;/sup&amp;gt; – 273.15.&amp;lt;/center&amp;gt;&lt;br /&gt;
&amp;lt;center&amp;gt;Dalton = 320.55 × {{w|Natural logarithm|''ln''(}} (Celsius + 273.15) / 273.15 ).&amp;lt;/center&amp;gt;&lt;br /&gt;
There is no standard abbreviation for Dalton's scale. While Dalton temperature is defined for all positive and negative numbers, the nonlinear scale is difficult to work with since the amount of heat represented by a change of one degree Dalton is not constant. Degrees Dalton differ from Celsius ones by as much as 3.9 degrees between 0 and 100, but diverge much more for more extreme temperatures. The rating (53.9/50) is a joke about the unit, as 53.9 Dalton equates to 50 degrees Celsius — i.e., it could be said to be 107.8% (even more than entirely) cursed.&lt;br /&gt;
|-&lt;br /&gt;
| °X || 42.9 || 151.4 || '''Title text:''' &amp;quot;In my new scale, °X, 0 is Earths' [''sic''] record lowest surface temperature, 50 is the global average, and 100 is the record highest, with a linear scale between each point and adjustment every year as needed.&amp;quot; || Randall has not stated the cursedness of his new scale. || The {{w|Lowest temperature recorded on Earth|record lowest surface temperature on Earth}} as of 2024 is –89.2°C (–128.6°F), recorded at the {{w|Vostok Station|Vostok Research Station}} in Antarctica on July 21, 1983.[https://wmo.asu.edu/content/world-lowest-temperature] The average surface temperature as of 2023, the most recent available, is 14.8°C (58.6°F.)[https://climate.copernicus.eu/climate-indicators/temperature] The {{w|Highest temperature recorded on Earth|record highest temperature}} is 56.7°C (134.1°F), recorded on July 10, 1913 at {{w|Furnace Creek, California|Furnace Creek Ranch}} in Death Valley, California.[https://wmo.asu.edu/content/world-highest-temperature]&lt;br /&gt;
&lt;br /&gt;
{{cot|Derivation and graph}}&lt;br /&gt;
To break the scale into two linear parts (below and above 14.8°C), we define two separate equations for each range:&lt;br /&gt;
&lt;br /&gt;
1. Below 14.8°C (from –89.2°C to 14.8°C):&lt;br /&gt;
* 0 °X corresponds to –89.2°C&lt;br /&gt;
* 50 °X corresponds to 14.8°C&lt;br /&gt;
&lt;br /&gt;
We calculate the slope m₁:&lt;br /&gt;
&lt;br /&gt;
&amp;lt;center&amp;gt;m₁ = (50 – 0) / (14.8 – (–89.2)) = 50 / (14.8 + 89.2) = 50 / 104 ≈ 0.48&amp;lt;/center&amp;gt;&lt;br /&gt;
&lt;br /&gt;
Now, using the point (14.8°C, 50 °X), we calculate the intercept b₁:&lt;br /&gt;
&lt;br /&gt;
&amp;lt;center&amp;gt;50 = 0.48 × 14.8 + b₁&amp;lt;/center&amp;gt;&lt;br /&gt;
&lt;br /&gt;
&amp;lt;center&amp;gt;50 = 7.1 + b₁&amp;lt;/center&amp;gt;&lt;br /&gt;
&lt;br /&gt;
&amp;lt;center&amp;gt;b₁ = 50 – 7.1 = 42.9&amp;lt;/center&amp;gt;&lt;br /&gt;
&lt;br /&gt;
Thus, the equation for temperatures '''below 14.8°C''' is:&lt;br /&gt;
&lt;br /&gt;
&amp;lt;center&amp;gt;'''X = 0.48 × C + 42.9'''&amp;lt;/center&amp;gt;&lt;br /&gt;
&lt;br /&gt;
2. Above 14.8°C (from 14.8°C to 56.7°C):&lt;br /&gt;
* 50 °X corresponds to 14.8°C&lt;br /&gt;
* 100 °X corresponds to 56.7°C&lt;br /&gt;
&lt;br /&gt;
We calculate the slope m₂:&lt;br /&gt;
&lt;br /&gt;
&amp;lt;center&amp;gt;m₂ = (100 – 50) / (56.7 – 14.8) = 50 / 41.9 ≈ 1.19&amp;lt;/center&amp;gt;&lt;br /&gt;
&lt;br /&gt;
Now, using the point (14.8°C, 50 °X), we calculate the intercept b₂:&lt;br /&gt;
&lt;br /&gt;
&amp;lt;center&amp;gt;50 = 1.19 × 14.8 + b₂&amp;lt;/center&amp;gt;&lt;br /&gt;
&lt;br /&gt;
&amp;lt;center&amp;gt;50 = 17.6 + b₂&amp;lt;/center&amp;gt;&lt;br /&gt;
&lt;br /&gt;
&amp;lt;center&amp;gt;b₂ = 50 – 17.6 = 32.4&amp;lt;/center&amp;gt;&lt;br /&gt;
&lt;br /&gt;
Thus, the equation for temperatures '''above 14.8°C''' is:&lt;br /&gt;
&lt;br /&gt;
&amp;lt;center&amp;gt;'''X = 1.19 × C + 32.4'''&amp;lt;/center&amp;gt;&lt;br /&gt;
&lt;br /&gt;
;Freezing and boiling points of water&lt;br /&gt;
&lt;br /&gt;
Freezing point of water (0°C): Since 0°C is below 14.8°C, we use the equation X = 0.48 × C + 42.9:&lt;br /&gt;
&lt;br /&gt;
&amp;lt;center&amp;gt;X = 0.48 × 0 + 42.9 = 42.9&amp;lt;/center&amp;gt;&lt;br /&gt;
&lt;br /&gt;
So, '''the freezing point is 42.9 °X.'''&lt;br /&gt;
&lt;br /&gt;
Boiling point of water (100°C): Since 100°C is above 14.8°C, we use the equation X = 1.19 × C + 32.4:&lt;br /&gt;
&lt;br /&gt;
&amp;lt;center&amp;gt;X = 1.19 × 100 + 32.4 = 119 + 32.4 = 151.4&amp;lt;/center&amp;gt;&lt;br /&gt;
&lt;br /&gt;
So, '''the boiling point is 151.4 °X.'''&lt;br /&gt;
&lt;br /&gt;
[[File:XvsC.png|400px|center]]&lt;br /&gt;
&lt;br /&gt;
See also [[2701: Change in Slope]] for a general discussion of separate linear scales between three points.&lt;br /&gt;
{{cob}}&lt;br /&gt;
&amp;lt;center&amp;gt;Celsius = (°X – 42.9) / 0.48 if °X &amp;lt; 50;&amp;lt;br/&amp;gt;or (°X – 32.4) / 1.19 if °X ≥ 50.&amp;lt;/center&amp;gt;&lt;br /&gt;
&amp;lt;center&amp;gt;°X = 0.48 × Celsius + 42.9 if Celsius &amp;lt; 14.8;&amp;lt;br/&amp;gt;or 1.19 × Celsius + 32.4 if Celsius ≥ 14.8.&amp;lt;/center&amp;gt;&lt;br /&gt;
&lt;br /&gt;
Due to average temperature records increasing almost every year as a result of {{w|climate change}},[https://www.space.com/last-12-months-broke-temperature-records] Randall's new °X scale must be re-calibrated each year. While such °X values for everyday temperatures will vary over time, more extreme values like absolute zero or the {{w|Tungsten#Physical properties|melting point of tungsten}} will shift vastly more.&lt;br /&gt;
&lt;br /&gt;
(&amp;quot;Surface&amp;quot; temperatures are measured 1.5 meters above ground inside a shaded shelter, to accurately represent air temperature, because measurements closer to the ground are usually quite different due to sunlight, {{w|albedo}}, and the thermal capacity of soil.)&lt;br /&gt;
|}&lt;br /&gt;
&lt;br /&gt;
[[File:Temperature Scales.png|center|600px]]&lt;br /&gt;
&lt;br /&gt;
===Examples===&lt;br /&gt;
&lt;br /&gt;
Here are some various temperatures in the above scales:&lt;br /&gt;
&lt;br /&gt;
{| class=wikitable style=&amp;quot;text-align: center;&amp;quot;&lt;br /&gt;
! Unit scale&lt;br /&gt;
! Typical {{w|room temperature}}&lt;br /&gt;
! {{w|Properties of water#Melting point|Freezing point of water}}&lt;br /&gt;
! {{w|Boiling point#Boiling point of water with elevation|Boiling point of water}}&lt;br /&gt;
! Midrange {{w|human body temperature|human body core temperature}}&lt;br /&gt;
! Recommended {{w|Refrigerator#Temperature zones and ratings|refrigerator temperature}}[https://www.realsimple.com/food-recipes/shopping-storing/food/refrigerator-temperature]&lt;br /&gt;
! Recommended {{w|Refrigerator#Freezer|freezer temperature}}[https://www.fsis.usda.gov/food-safety/safe-food-handling-and-preparation/food-safety-basics/freezing-and-food-safety]&lt;br /&gt;
! Typical warm bath temperature[https://www.kohlerwalkinbath.com/blog/everything-you-need-to-know-about-the-ideal-bath-temperature/]&lt;br /&gt;
! Typical {{w|Coffee#Brewing|hot coffee}} temperature&lt;br /&gt;
|-&lt;br /&gt;
| Celsius || 22 °C || 0 °C || 100 °C || 37 °C || 2.5 °C || –18 °C || 39 °C || 77 °C&lt;br /&gt;
|-&lt;br /&gt;
| Kelvin || 295 K || 273 K || 373 K || 310 K || 276 K || 255 K || 312 K || 350 K&lt;br /&gt;
|-&lt;br /&gt;
| Fahrenheit || 72 °F || 32 °F || 212 °F || 98.6 °F || 36.5 °F || 0 °F || 102 °F || 171 °F&lt;br /&gt;
|-&lt;br /&gt;
| Réaumur || 17.6 °Ré || 0 °Ré || 80 °Ré || 29.6 °Ré || 2 °Ré || –14.4 °Ré || 31.2 °Ré || 61.6 °Ré&lt;br /&gt;
|-&lt;br /&gt;
| Rømer || 19.1 °Rø || 7.5 °Rø || 60 °Rø || 26.9 °Rø || 8.8 °Rø || –2 °Rø || 28 °Rø || 47.9 °Rø&lt;br /&gt;
|-&lt;br /&gt;
| Rankine || 531 °Ra || 492 °Ra || 672 °Ra || 558 °Ra || 496 °Ra || 459 °Ra || 562 °Ra || 630 °Ra&lt;br /&gt;
|-&lt;br /&gt;
| Newton || 7.1 °N || 0 °N || 34 °N || 12 °N || 0.8 °N || –5.8 °N || 12.7 °N || 26 °N&lt;br /&gt;
|-&lt;br /&gt;
| Wedgwood || –7.71 °W || –8 °W || –6.7 °W || –7.52 °W || –7.97 °W || –8.23 °W || –7.49 °W || –7 °W&lt;br /&gt;
|-&lt;br /&gt;
| Galen || 0 || –4 || 4 || 0.8 || –3.5 || –7.3 || 0.9 || 2.8&lt;br /&gt;
|-&lt;br /&gt;
| ''Real'' Celsius || 78 || 100 || 0 || 63 || 98 || 118 || 61 || 23&lt;br /&gt;
|-&lt;br /&gt;
| Dalton || 24.8 || 0 || 100 || 40.7 || 2.9 || –21.9 || 42.8 || 79.6&lt;br /&gt;
|-&lt;br /&gt;
| °X || 59 °X || 43 °X || 151 °X || 76.4 °X || 44.1 °X || 34.3 °X || 78.8 °X || 124 °X&lt;br /&gt;
|-&lt;br /&gt;
| Felsius || 47 || 16 || 156 || 67.8 || 19.5 || –9.2 || 70.6 || 123.8&lt;br /&gt;
|}&lt;br /&gt;
&lt;br /&gt;
Here are the conversion formulas for the [[1923: Felsius|Felsius scale from comic 1923]]:&lt;br /&gt;
&amp;lt;center&amp;gt;Celsius = (Felsius − 16) / 1.4.&amp;lt;/center&amp;gt;&lt;br /&gt;
&amp;lt;center&amp;gt;Felsius = Celsius * 7/5 + 16.&amp;lt;/center&amp;gt;&lt;br /&gt;
&lt;br /&gt;
==Transcript==&lt;br /&gt;
&lt;br /&gt;
:Temperature Scales&lt;br /&gt;
&lt;br /&gt;
:[A table with five columns, labelled: Unit, Water freezing point, Water boiling point, Notes, and Cursedness. There are eleven rows below the labels.]&lt;br /&gt;
&lt;br /&gt;
:[Row 1:] Celsius, 0, 100, Used in most of the world, 2/10&lt;br /&gt;
:[Row 2:] Kelvin, 273.15, 373.15, 0K is absolute zero, 2/10&lt;br /&gt;
:[Row 3:] Fahrenheit, 32, 212, Outdoors in most places is between 0–100, 3/10&lt;br /&gt;
:[Row 4:] Réaumur, 0, 80, Like Celsius, but with 80 instead of 100, 3/8&lt;br /&gt;
:[Row 5:] Rømer, 7.5, 60, Fahrenheit precursor with similarly random design, 4/10,&lt;br /&gt;
:[Row 6:] Rankine, 491.7, 671.7, Fahrenheit, but with 0°F set to absolute zero, 6/10&lt;br /&gt;
:[Row 7:] Newton, 0, 33-ish, Poorly defined, with reference points like &amp;quot;the hottest water you can hold your hand in&amp;quot;, 7-ish/10&lt;br /&gt;
:[Row 8:] Wedgewood, –8, –6.7, Intended for comparing the melting points of metals, all of which it was very wrong about, 9/10&lt;br /&gt;
:[Row 9:] Galen, –4?, 4??, Runs from –4 (cold) to 4 (hot). 0 is &amp;quot;normal&amp;quot;(?), 4/–4&lt;br /&gt;
:[Row 10:] ''Real'' Celsius, 100, 0, In Anders Celsius's original specification, bigger numbers are ''colder''; others later flipped it, 10/0&lt;br /&gt;
:[Row 11:] Dalton, 0, 100, A nonlinear scale; 0°C and 100°C are 0 and 100 Dalton, but 50°C is 53.9 Dalton, 53.9/50&lt;br /&gt;
&lt;br /&gt;
{{comic discussion}}&lt;br /&gt;
&lt;br /&gt;
[[Category:Charts]]&lt;br /&gt;
[[Category:Math]]&lt;br /&gt;
[[Category:Physics]]&lt;br /&gt;
[[Category:Science]]&lt;/div&gt;</summary>
		<author><name>141.101.109.166</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=Talk:2999:_Bad_Map_Projection:_The_United_Stralia&amp;diff=353080</id>
		<title>Talk:2999: Bad Map Projection: The United Stralia</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=Talk:2999:_Bad_Map_Projection:_The_United_Stralia&amp;diff=353080"/>
				<updated>2024-10-17T01:00:49Z</updated>
		
		<summary type="html">&lt;p&gt;141.101.109.166: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;&amp;lt;!--Please sign your posts with ~~~~ and don't delete this text. New comments should be added at the bottom.--&amp;gt;&lt;br /&gt;
&lt;br /&gt;
He forgot the Idaho  abbreviation. [[User:Danger Kitty|Danger Kitty]] ([[User talk:Danger Kitty|talk]])&lt;br /&gt;
hello[[Special:Contributions/172.68.54.64|172.68.54.64]] 19:49, 16 October 2024 (UTC)&lt;br /&gt;
&lt;br /&gt;
:: And Mississippi has stolen Michigan's abbreviation! [[Special:Contributions/172.70.206.240|172.70.206.240]] 23:18, 16 October 2024 (UTC)&lt;br /&gt;
&lt;br /&gt;
5 likes and I will make this a reality [[User:CalibansCreations|'''&amp;lt;span style=&amp;quot;color:#ff0000;&amp;quot;&amp;gt;Caliban&amp;lt;/span&amp;gt;''']] ([[User talk:CalibansCreations|talk]]) 20:10, 16 October 2024 (UTC)&lt;br /&gt;
&lt;br /&gt;
Probably this is because I'm more familiar with the map of Australia than of the US, but Melbourne seems to have moved quite a bit to the east and is now presumably in Gippsland? Oddly that's the most jarring change for me... [[User:Zoid42|Zoid42]] ([[User talk:Zoid42|talk]]) 20:26, 16 October 2024 (UTC)&lt;br /&gt;
&lt;br /&gt;
:: Yep. {{w|Melbourne Florida}}. [[Special:Contributions/172.70.47.10|172.70.47.10]] 21:56, 16 October 2024 (UTC)&lt;br /&gt;
&lt;br /&gt;
An eight-legged gator with fangs the size of your arm, six eyes, and the ability to spin webs is truly a horrifying thought. [[User:Psychoticpotato|P?sych??otic?pot??at???o ]] ([[User talk:Psychoticpotato|talk]]) 21:07, 16 October 2024 (UTC)&lt;br /&gt;
&lt;br /&gt;
:: At that point most of the NT would become to dangerous for people to live. [[User:SomeRandomNerd|SomeRandomNerd]] ([[User talk:SomeRandomNerd|talk]]) 23:21, 16 October 2024 (UTC)&lt;br /&gt;
&lt;br /&gt;
If find it weird how tasmania is florida, as while they are in the same place, they are the least alike 2 places you could think of. [[User:SomeRandomNerd|SomeRandomNerd]] ([[User talk:SomeRandomNerd|talk]]) 22:35, 16 October 2024 (UTC)&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
Part of the joke is that the contiguous 48 States plus DC have nearly the same area as Australia, though the US has a larger total area.&lt;br /&gt;
&lt;br /&gt;
[[Special:Contributions/141.101.109.166|141.101.109.166]] 01:00, 17 October 2024 (UTC)&lt;/div&gt;</summary>
		<author><name>141.101.109.166</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=Talk:2997:_Solar_Protons&amp;diff=352721</id>
		<title>Talk:2997: Solar Protons</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=Talk:2997:_Solar_Protons&amp;diff=352721"/>
				<updated>2024-10-12T07:28:47Z</updated>
		
		<summary type="html">&lt;p&gt;141.101.109.166: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;&amp;lt;!--Please sign your posts with ~~~~ and don't delete this text. New comments should be added at the bottom.--&amp;gt;&lt;br /&gt;
cute and wholesome 😊 [[User:CalibansCreations|'''&amp;lt;span style=&amp;quot;color:#ff0000;&amp;quot;&amp;gt;Caliban&amp;lt;/span&amp;gt;''']] ([[User talk:CalibansCreations|talk]]) 17:29, 11 October 2024 (UTC)&lt;br /&gt;
&lt;br /&gt;
Re, &amp;quot;idealized depiction&amp;quot;: does this mean it's not a real photo?  Is it AI?  It would be nice to know the source, if possible. [[Special:Contributions/162.158.175.99|162.158.175.99]] 17:57, 11 October 2024 (UTC)&lt;br /&gt;
&lt;br /&gt;
:tfw you forget Randall Munroe is an artist [[Special:Contributions/162.158.103.90|162.158.103.90]] 19:50, 11 October 2024 (UTC)&lt;br /&gt;
::It's an easy mistake... [[Special:Contributions/141.101.109.166|141.101.109.166]] 07:28, 12 October 2024 (UTC)&lt;br /&gt;
&lt;br /&gt;
3D stick figure is peak blursed [[Special:Contributions/172.70.210.235|172.70.210.235]] 18:22, 11 October 2024 (UTC)&lt;/div&gt;</summary>
		<author><name>141.101.109.166</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=2993:_Ingredients&amp;diff=352137</id>
		<title>2993: Ingredients</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=2993:_Ingredients&amp;diff=352137"/>
				<updated>2024-10-05T15:23:58Z</updated>
		
		<summary type="html">&lt;p&gt;141.101.109.166: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;{{comic&lt;br /&gt;
| number    = 2993&lt;br /&gt;
| date      = October 2, 2024&lt;br /&gt;
| title     = Ingredients&lt;br /&gt;
| image     = ingredients_2x.png&lt;br /&gt;
| imagesize = 417x473px&lt;br /&gt;
| noexpand  = true&lt;br /&gt;
| titletext = Add main-belt asteroids to taste.&lt;br /&gt;
}}&lt;br /&gt;
&lt;br /&gt;
==Explanation==&lt;br /&gt;
{{incomplete|Created by THE FIVE BEST EXPLAINXKCD USERS COMBINED INTO ONE - Compare the combined surface area to that of Mars (also check both the actual surface area of the five as well as the surface area of a sphere with the total moons volume, which would be a much smaller surface area than of the five moons sum of surface area... Do NOT delete this tag too soon.}}&lt;br /&gt;
&lt;br /&gt;
This comic jokes that it is possible, and perhaps intended, to use the five largest moons in the outer solar system (the {{w|Galilean moons}} and {{w|Titan (moon)|Titan}}) as ingredients to create a “better” planet that has the “coolest features”. Apparently, though, Randall couldn't actually think of anything cool that {{w|Ganymede (moon)|Ganymede}} and {{w|Callisto (moon)|Callisto}} would contribute, so these have just been used as 'filler'. (However, Ganymede does have a magnetic field, which is kind of cool....)&lt;br /&gt;
&lt;br /&gt;
Note that {{w|Moon|Earth's moon}} is the fifth-largest moon of the solar system overall ({{w|Europa (moon)|Europa}} is the sixth), so it would have been included had &amp;quot;outer solar system&amp;quot; not been specified.&lt;br /&gt;
&lt;br /&gt;
{| class=&amp;quot;wikitable&amp;quot;&lt;br /&gt;
!Name of moon&lt;br /&gt;
!Ingredient&lt;br /&gt;
!Volume&amp;lt;br&amp;gt;(billion km&amp;lt;sup&amp;gt;3&amp;lt;/sup&amp;gt;)&lt;br /&gt;
!Surface area&amp;lt;br&amp;gt;(million km&amp;lt;sup&amp;gt;2&amp;lt;/sup&amp;gt;)&lt;br /&gt;
!Mass&amp;lt;br&amp;gt;(sextillion kg)&lt;br /&gt;
!Explanation&lt;br /&gt;
|-&lt;br /&gt;
| {{w|Io (moon)|Io}} || Sulfur || style=&amp;quot;text-align:center;&amp;quot;|25.3 || style=&amp;quot;text-align:center;&amp;quot;|41.7 || style=&amp;quot;text-align:center;&amp;quot;|89.4 || Io is composed of hundreds of active volcanoes which produce plumes of sulfur and sulfur dioxide.&lt;br /&gt;
|-&lt;br /&gt;
| {{w|Europa (moon)|Europa}} || Oceans || style=&amp;quot;text-align:center;&amp;quot;|15.9 || style=&amp;quot;text-align:center;&amp;quot;|30.9 || style=&amp;quot;text-align:center;&amp;quot;|48.0 || Europa is believed to have a subsurface ocean of liquid water below its icy crust.&lt;br /&gt;
|- &lt;br /&gt;
| {{w|Titan (moon)|Titan}} || Hydrocarbons || style=&amp;quot;text-align:center;&amp;quot;|71.6 || style=&amp;quot;text-align:center;&amp;quot;|83.3 || style=&amp;quot;text-align:center;&amp;quot;|134.5 ||  Titan has a dense atmosphere of nitrogen, methane and other minor components, leading to the formation of hydrocarbon clouds and heavy organonitrogen haze.&lt;br /&gt;
|-&lt;br /&gt;
| {{w|Ganymede (moon)|Ganymede}} || rowspan=&amp;quot;2&amp;quot;|Filler || style=&amp;quot;text-align:center;&amp;quot;|76.6 || style=&amp;quot;text-align:center;&amp;quot;|87.2 || style=&amp;quot;text-align:center;&amp;quot;|148.2 || rowspan=&amp;quot;2&amp;quot;|Randall considers Ganymede and Callisto to have no special features and uses them merely as “filler” for the combined planet.&lt;br /&gt;
|-&lt;br /&gt;
| {{w|Callisto (moon)|Callisto}} || style=&amp;quot;text-align:center;&amp;quot;|58.7 || style=&amp;quot;text-align:center;&amp;quot;|73.0 || style=&amp;quot;text-align:center;&amp;quot;|107.6&lt;br /&gt;
|-&lt;br /&gt;
|}&lt;br /&gt;
&lt;br /&gt;
If all of these moons were lumped together, the total volume of “Randall's planet” would be 248 billion km&amp;lt;sup&amp;gt;3&amp;lt;/sup&amp;gt;, assuming no further material compaction, with a surface area of 191 million km&amp;lt;sup&amp;gt;2&amp;lt;/sup&amp;gt;. This is about 1½ times the volume of {{w|Mars}}, or roughly a 15% larger diameter. The combined mass, however, would be smaller than that of Mars.&lt;br /&gt;
&lt;br /&gt;
The title text takes it further, treating asteroids as a [[1639: To Taste|“to-taste”]] ingredient in this “recipe”, treating it more like preparing a food dish rather than making a new Mars-sized planet.&lt;br /&gt;
&lt;br /&gt;
There are a number of science fiction works that posit that advanced alien civilizations left puzzles in the solar system for future humans to solve. Examples for this trope are {{w|Pushing Ice}} by Alastair Reynolds and {{w|Rogue Moon}} by Algis Budrys. The Arthur C. Clarke stories {{w|The Sentinel (short story)|The Sentinel}} and {{w|Encounter in the Dawn}} (and the more well-known ''2001: A Space Odyssey'' {{w|2001: A Space Odyssey (novel)|book}} and {{w|2001: A Space Odyssey|film}} treatments that they later helped inspire) each feature various partial treatments of this concept. Caltech Professor David Goodstein also speculated in [https://www.youtube.com/watch?v=KNHd__ed40M&amp;amp;t=1594s The Mechanical Universe] the possibility that {{w|Saturn}} is an alien message system.&lt;br /&gt;
&lt;br /&gt;
==Transcript==&lt;br /&gt;
:[A planet is shown with several different features like oceans and large lakes as well as and craters. It seems like the continent is fused together from five different segments, with cracks between where there is either ocean or rivers. There are four labels above the planet with lines going down to different areas of the planet, but not necessarily pointing to any particular part on the surface, but rather to the entire planet:]&lt;br /&gt;
:Sulfur chemistry from Io&lt;br /&gt;
:Cool oceans from Europa&lt;br /&gt;
:Hydrocarbons from Titan&lt;br /&gt;
:Ganymede and Callisto (filler)&lt;br /&gt;
&lt;br /&gt;
:[Caption beneath the panel:]&lt;br /&gt;
:Scientists now think the five biggest outer solar system moons are actually just ingredients; we're supposed to combine them to create a single Mars-sized planet that's cooler than any of them.&lt;br /&gt;
&lt;br /&gt;
{{comic discussion}}&lt;br /&gt;
&lt;br /&gt;
[[Category:Space]]&lt;br /&gt;
[[Category:Food]] &amp;lt;!-- Title is ingredients and the title text talks about adding to taste, making it seem like this is a recipe for food--&amp;gt;&lt;/div&gt;</summary>
		<author><name>141.101.109.166</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=2982:_Water_Filtration&amp;diff=350209</id>
		<title>2982: Water Filtration</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=2982:_Water_Filtration&amp;diff=350209"/>
				<updated>2024-09-09T12:56:12Z</updated>
		
		<summary type="html">&lt;p&gt;141.101.109.166: /* Explanation */&lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;{{comic&lt;br /&gt;
| number    = 2982&lt;br /&gt;
| date      = September 6, 2024&lt;br /&gt;
| title     = Water Filtration&lt;br /&gt;
| image     = water_filtration_2x.png&lt;br /&gt;
| imagesize = 593x467px&lt;br /&gt;
| noexpand  = true&lt;br /&gt;
| titletext = You'd think the most expensive part would be the quark-gluon plasma chamber, but it's actually usually the tube to the top of the atmosphere to carry the cosmic rays down.&lt;br /&gt;
}}&lt;br /&gt;
&lt;br /&gt;
==Explanation==&lt;br /&gt;
{{incomplete|Created by WATER. JUST PLAIN WATER. NOTHING DONE TO IT, JUST PLAIN WATER. POSSIBLY DRINKABLE. - Do NOT &amp;lt;s&amp;gt;drink the water&amp;lt;/s&amp;gt; delete this tag too soon.}}&lt;br /&gt;
This comic seems to be a diagram of how well water is purified, a common procedure done to make said water safe to drink. However, this well water is &amp;quot;purified&amp;quot; through a series of increasingly unnecessary, expensive, and possibly hazardous steps, ending with producing &amp;quot;pure&amp;quot; water synthesized from hydrogen and oxygen - before promptly undoing most of the work by re-adding raw well water, along with minerals and probiotics &amp;quot;for taste and to support immune health&amp;quot;.&lt;br /&gt;
&lt;br /&gt;
{| class=&amp;quot;wikitable&amp;quot;&lt;br /&gt;
|-&lt;br /&gt;
!Step&lt;br /&gt;
!Real Device?&lt;br /&gt;
!Used for water purification?&lt;br /&gt;
!Explanation&lt;br /&gt;
|-&lt;br /&gt;
|Water softener&lt;br /&gt;
|{{Yes|Real}}&lt;br /&gt;
|{{Yes}}&lt;br /&gt;
|{{w|Water softening}} is the removal of calcium, magnesium, and certain other metal cations in hard water. The resulting soft water requires less soap for the same cleaning effort, as soap is not wasted bonding with calcium ions. Soft water also extends the lifetime of plumbing by reducing or eliminating scale build-up in pipes and fittings. The comic shows the water either being passed through some granulated material (presumably, {{w|ion-exchange resins}}) or into a precipitation chamber for lime (or soda ash) softening.&lt;br /&gt;
|-&lt;br /&gt;
|Reverse osmosis&lt;br /&gt;
|{{Yes|Real}}&lt;br /&gt;
|{{Yes}}&lt;br /&gt;
|{{w|Reverse osmosis}} is a common step used in modern water-purification systems. It relies on using osmotic membranes and high pressures to separate water molecules from dissolved solutes and biological substances. Interestingly, it would also act as a softening step, rendering the previous step potentially redundant, depending on the goals for each step. It's also overkill for most wells, as groundwater often needs treatment targeted to only a few contaminants, if any treatment at all. &lt;br /&gt;
|-&lt;br /&gt;
|Ultraviolet Sterilization&lt;br /&gt;
|{{Yes|Real}}&lt;br /&gt;
|{{Yes}}&lt;br /&gt;
|{{w|Ultraviolet germicidal irradiation|Ultraviolet sterilization}} uses UV lamps at short wavelengths to damage the DNA and thereby kill micro-organisms in the water. In the USA, this is an unlikely method of well water sterilization, as the pathogens most likely to be found in well water (as opposed to surface water) are generally much more responsive to chemical disinfection. Many wells don't even need a disinfection step; whether this well needs disinfection or not, this is hardly the most impractical step in this treatment train. &lt;br /&gt;
|-&lt;br /&gt;
|Autoclave&lt;br /&gt;
|{{Yes|Real}}&lt;br /&gt;
|{{Yes}}&lt;br /&gt;
|{{w|Autoclaves}} are essentially large pressure cookers that sterilize items and liquids through exposing them to a high temperature (~120°C or ~248°F) over tens of minutes in presence of water. By maintaining a high pressure, the boiling point of water goes up. This creates a very hot and humid atmosphere, making efficient heat transfer with all contents and inactivating all biological entities through this heat. They are commonly used in hospital and laboratory settings to sterilize plastics, glassware, equipment and solutions (like bottles of growth medium for bacteria) to be used in a sterile environment. The advantage of this method compared to dry heat (aka putting things in a 150°C-180°C oven until they are sterile) is that most lab plastics survive a passage at 120°C without melting. While difficult to streamline (as this technique is used for batches), it has the advantage over light-based methods that heat gets everywhere, and that instead of just damaging DNA, you also denature the proteins and other structures of microorganisms. &lt;br /&gt;
|-&lt;br /&gt;
|Condenser&lt;br /&gt;
|{{Yes|Real}}&lt;br /&gt;
|{{Yes}}&lt;br /&gt;
|This step condenses the steam generated by the autoclave back into water. This is a normal part of the process used in &amp;quot;traditional&amp;quot; water purification by distillation. &lt;br /&gt;
|-&lt;br /&gt;
|Regular osmosis&lt;br /&gt;
|{{Yes|Real}}&lt;br /&gt;
|{{No}}&lt;br /&gt;
|Regular osmosis (also known as &amp;quot;osmosis&amp;quot;) is the tendency of a solvent (like water) to flow through a semipermeable membrane towards the side that has a higher concentration of dissolved molecules or ions. Since the water is already highly purified at this point, osmosis would only work if the output water is ''less'' pure, adding dissolved substances to it.&lt;br /&gt;
|-&lt;br /&gt;
|X-Ray Sterilization&lt;br /&gt;
|{{Yes|Real}}&lt;br /&gt;
|{{No}}&lt;br /&gt;
|While {{w|Sterilization_(microbiology)#Ionizing_radiation_sterilization|x-ray sterilization}} is used to sterilize equipment, it is not normally used for water.&lt;br /&gt;
|-&lt;br /&gt;
|Carbon Filter&lt;br /&gt;
|{{No|Fake}}&lt;br /&gt;
|{{No}}&lt;br /&gt;
|The water is passed through some volume of carbon - a riff on activated carbon filters, which ''are'' used in water filtration as seen later in the process.&lt;br /&gt;
|-&lt;br /&gt;
|Neutron Source&lt;br /&gt;
|{{Yes|Real}}&lt;br /&gt;
|{{No}}&lt;br /&gt;
|A {{w|neutron source}} generates high-energy neutrons. High-energy neutrons are highly penetrating and will cause ionization events to occur due to collision with atoms in the water. This can potentially make the water more radioactive due to the generation of radioactive isotopes.&lt;br /&gt;
|-&lt;br /&gt;
|Activated Carbon Filter&lt;br /&gt;
|{{Yes|Real}}&lt;br /&gt;
|{{Yes}}&lt;br /&gt;
|{{w|Activated carbon}} is a form of carbon commonly used to filter contaminants from water and air, as it has a large surface area available to adsorb impurities on its surface. While this isn't a strange step to see in a water purification process, Randall makes a pun here with its proximity to the neutron source - the carbon has been '{{w|Neutron activation|activated}}' by the neutron source, and is currently radioactive. Water filtered through this may pick up radioactive isotopes from the filter.&lt;br /&gt;
|-&lt;br /&gt;
|Gamma Ray Sterilization&lt;br /&gt;
|{{Yes|Real}}&lt;br /&gt;
|{{No}}&lt;br /&gt;
|Similar to x-ray sterilization, this step uses {{w|Sterilization (microbiology)#Ionizing radiation sterilization|gamma rays}} to sterilize the water. Gamma rays can potentially irradiate the water through photodisintegration if their energy is higher than the binding energy of oxygen.&lt;br /&gt;
|-&lt;br /&gt;
|Cosmic Ray Sterilization&lt;br /&gt;
|{{No|Fake}}&lt;br /&gt;
|{{No}}&lt;br /&gt;
|Similar to the previous step, but this time using high energy {{w|cosmic rays}} to do so. This would be incredibly impractical, as cosmic rays are generally blocked by the atmosphere at high altitudes (as stated in the title text). Furthermore, their extremely high energy (shown to be in the exa-electron volt (EeV, or 10&amp;lt;sup&amp;gt;18&amp;lt;/sup&amp;gt; eV) range) would cause multiple high-energy particles to be created on impact with the water molecules, irradiating the water significantly.&lt;br /&gt;
|-&lt;br /&gt;
|Electrolysis&lt;br /&gt;
|{{Yes|Real}}&lt;br /&gt;
|{{No}}&lt;br /&gt;
|The water is broken down into hydrogen and oxygen gas using an electric current. Assuming the gas outputs of this process are pure hydrogen and oxygen gas, this *would* be an extremely effective sterilization tactic, seeing as no known organism or water pollutant is entirely composed out of hydrogen or oxygen gas. Along with the next step, this step may be a misguided attempt to &amp;quot;take the water apart and clean each part individually&amp;quot;. The hydrogen is sent to the ionizer, while the oxygen is sent to the oxygen spallation step.&lt;br /&gt;
|-&lt;br /&gt;
|Oxygen Spallation&lt;br /&gt;
|{{No|Fake}}&lt;br /&gt;
|{{No}}&lt;br /&gt;
|Almost all oxygen in existence was originally created via {{w|stellar nucleosynthesis}}. Now, in this step in the purification, the oxygen is apparently broken down back into hydrogen via a fictional form of {{w|Cosmic_ray_spallation|spallation}}. While spallation can form lighter nuclei from heavier ones, there is no known process to convert oxygen back down to hydrogen. It is unclear what happens to the neutrons present in the oxygen nuclei - whether they are removed, used to create hydrogen isotopes or allowed to decay into protons and electrons (the components of yet more hydrogen, when properly reintroduced). The hydrogen formed here is merged with the rest of the hydrogen before being sent to the ionizer.&lt;br /&gt;
|-&lt;br /&gt;
|Ionizer&lt;br /&gt;
|{{Yes|Real}}&lt;br /&gt;
|{{No}}&lt;br /&gt;
|The hydrogen output by the previous step is made into a plasma with free electrons and protons (not bound into atoms).&lt;br /&gt;
|-&lt;br /&gt;
|Quark-Gluon Plasma Chamber&lt;br /&gt;
|{{No|Fake}}&lt;br /&gt;
|{{No}}&lt;br /&gt;
|The plasma output from the previous step is further energized into a {{w|quark–gluon plasma}}, such as the one found just after the Big Bang. This follows the theme of the previous steps, which all serve to break the water down into their elementary components. The incredible energies involved in doing so are unachievable by current technologies (current particle accelerators can form such a plasma for very short periods of time and involve a very small amount of matter), and serve to highlight the impracticality of this setup (as alluded to in the title text). The energies would also result in formation of lepton pairs from energy, which is presumably where the electrons from the previous step ended up.&lt;br /&gt;
|-&lt;br /&gt;
|Hydrogenation&lt;br /&gt;
|style=&amp;quot;background:#FFFF9E;vertical-align:middle;text-align:{{{align|center}}};{{{style|}}}&amp;quot; class=&amp;quot;table-yes&amp;quot;|Kinda&lt;br /&gt;
|{{No}}&lt;br /&gt;
|This process converts the quark-gluon plasma output in the previous step into elemental hydrogen, reversing the previous two steps. Presumably, this is done via {{w|hadronization}} and {{w|recombination}}; however, it is unclear how the {{w|baryon asymmetry}} needed to generate matter and not anti-matter is developed. The resulting hydrogen is split into 2 streams leading into the Nucleosynthesis and Reverse Electrolysis steps. In real life, {{w|hydrogenation}} is the process of adding hydrogen to unsaturated hydrocarbons. &lt;br /&gt;
|-&lt;br /&gt;
|Nucleosynthesis&lt;br /&gt;
|{{No|Fake}}&lt;br /&gt;
|{{No}}&lt;br /&gt;
|Part of the hydrogen produced in the previous step is converted into oxygen via 2 sub-processes. The hydrogen is first converted into helium and carbon through a combination of the {{w|proton-proton chain}} and the {{w|CNO cycle}} as per the labels on the step. The helium and carbon are then converted into oxygen through the {{w|alpha process}}. This step may also involve the {{w|triple-alpha process}}, seeing that the alpha process is typically only applicable to converting carbon into heavier elements owing to the lack of a stable element with eight nucleons. These steps normally occur in the cores of massive stars. It is not known how the oxygen is filtered from the extremely hot plasma of fusion products.&lt;br /&gt;
|-&lt;br /&gt;
|Reverse Electrolysis&lt;br /&gt;
|{{Yes|Real}}&lt;br /&gt;
|{{No}}&lt;br /&gt;
|This step is essentially a fuel cell, utilizing an electrochemical reaction to convert hydrogen and oxygen back into water and electricity.&lt;br /&gt;
|-&lt;br /&gt;
|Adding Well Water&lt;br /&gt;
|{{Yes|Real}}&lt;br /&gt;
|{{Yes}}&lt;br /&gt;
|A second pipe is linked to the first that simply feeds untreated well water into the pipes, partially undoing the entire process. Even if the well water is only a small portion of the faucet water, its presence has now made the now incredibly pure water impure. This act of putting well water into the faucet after treating it may be a riff on the cultural interest in &amp;quot;spring water&amp;quot; or &amp;quot;pure glacial water&amp;quot; that is said to have additional minerals or beneficial properties but is oftentimes not meaningfully distinct from properly treated tap water. &amp;quot;Local minerals and probiotics added&amp;quot; may be a reference to Coke's &amp;quot;Dasani&amp;quot; brand drinking water, which is purified by reverse osmosis, and then has a package of minerals added to create the flavor (pure water's actual lack of flavor can be perceived as an unpleasantly 'flat' flavor).&lt;br /&gt;
&lt;br /&gt;
In addition, drinking only {{w|Tonicity|extremely hypotonic}} liquid intake can induce the body to expel more water than it took in (taking with it some essential minerals that are not being replaced) to try to maintain equilibrium of concentrations. This effect is not directly dangerous, but could exacerbate other bodily deficiencies in the long term and have the issues of greater than necessary liquid throughput than with 'normal' drinking water. The tendency for {{w|Sports drink#Categories|many 'sports' or 'health' drinks}} to hype the term 'isotonic' is based upon the idea that an ideal concentration of solutes can be added, in-between the opposing problems of having either too many ''or'' too few 'impurities'. The process does not include adding untreated (and probably also untested/unquantified) ground water, which could carry pathogenic organisms and chemicals, and appears to have no mechanism for ensuring what ''might'' be an acceptable level of re-blending for the circumstances.&lt;br /&gt;
&lt;br /&gt;
Alternatively, it may be that the level of purity achieved by this setup is so overkill, and the cost per liter processed so high, that it's simply more efficient to treat just enough of the water to dilute the rest of the water to acceptable levels of contaminants. For example, it's common to use a partial bypass to supply water to the shower, since shower water does not need to be potable. Also, some well water systems are clean enough to not need any treatment at all and can be used straight from the well, and some water systems are only slightly high in a single chemical contaminant that can be addressed by blending the water, either with treated water or another source (treated or untreated). Perhaps the treatment process led to enough radioactivity that blending with the original source was required to address radiological contamination (either gross alpha radiation or specific radionuclides).&lt;br /&gt;
|}&lt;br /&gt;
&lt;br /&gt;
The title text briefly covers the cost implications of the components. Various 'real' filter elements will have material or energy costs or both, in operation or to replenish their effectiveness, and the high energy input needed to disassociate hadrons into raw quark–gluon plasma (at bulk levels) would seem to require the most in terms of running the equipment. But it is pointed out that to ''ensure'' enough cosmic rays reach that particular phase of sterilization, there would have to be a pipe (not shown) leading out to the edge of the atmosphere to optimistically carry down such particles (due to also containing ''no'' air, i.e., keeping it out to negate the normal {{w|Air shower (physics)|shielding and dissipating effect}} of the atmosphere on cosmic rays).&lt;br /&gt;
&lt;br /&gt;
Whether a one-off cost or needing regular replacement, the setting up of such a tubular structure (a vertical air-proof pipe perhaps somewhere between 100 and 10000 kilometers high) would be technically challenging and has not ever been actually accomplished. The conditions for a quark–gluon plasma, albeit in limited quantities, at least have been fulfilled at {{w|CERN}}, with its 27 kilometer airless pipe that goes round within a vast circular tunnel.&lt;br /&gt;
&lt;br /&gt;
==Transcript==&lt;br /&gt;
{{incomplete transcript|Do NOT delete this tag too soon.}}&lt;br /&gt;
&lt;br /&gt;
:[Header:]&lt;br /&gt;
:How Water Filtration Works&lt;br /&gt;
&lt;br /&gt;
:[A system of various devices between water pipes is shown.]&lt;br /&gt;
:[Input:]&lt;br /&gt;
:Well water&lt;br /&gt;
:[Labels of various devices:]&lt;br /&gt;
:Water softener&lt;br /&gt;
:Reverse osmosis&lt;br /&gt;
:Ultraviolet sterilization&lt;br /&gt;
:Autoclave&lt;br /&gt;
:Condenser&lt;br /&gt;
:Regular osmosis&lt;br /&gt;
:X-ray sterilization&lt;br /&gt;
:Carbon filter&lt;br /&gt;
:Neutron source&lt;br /&gt;
:Activated carbon filter&lt;br /&gt;
:Gamma ray sterilization&lt;br /&gt;
:Cosmic ray sterilization [On the device: &amp;quot;EeV γ&amp;quot;]&lt;br /&gt;
:Electrolysis [H&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O split into O and H]&lt;br /&gt;
:Oxygen spallation [O becomes H]&lt;br /&gt;
:Ionizer [H split into + and -]&lt;br /&gt;
:Quark-gluon plasma chamber [+ and - become QGP]&lt;br /&gt;
:Hydrogenation [QGP becomes H]&lt;br /&gt;
:Nucleosynthesis [H goes through &amp;quot;P-P CNO&amp;quot; and becomes He and C, then through &amp;quot;Alpha&amp;quot; and becomes O]&lt;br /&gt;
:Reverse electrolysis&lt;br /&gt;
:[Output after devices:]&lt;br /&gt;
:Pure water&lt;br /&gt;
:[Second input, mixed with pure water:]&lt;br /&gt;
:Well water&lt;br /&gt;
:[Label:]&lt;br /&gt;
:Local minerals and probiotics added for taste and to support immune health&lt;br /&gt;
:[Final output:]&lt;br /&gt;
:To faucet&lt;br /&gt;
&lt;br /&gt;
{{comic discussion}}&lt;br /&gt;
&lt;br /&gt;
[[Category:Chemistry]]&lt;br /&gt;
[[Category:Physics]]&lt;/div&gt;</summary>
		<author><name>141.101.109.166</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=2973:_Ferris_Wheels&amp;diff=348859</id>
		<title>2973: Ferris Wheels</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=2973:_Ferris_Wheels&amp;diff=348859"/>
				<updated>2024-08-17T16:06:58Z</updated>
		
		<summary type="html">&lt;p&gt;141.101.109.166: /* Transcript */&lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;{{comic&lt;br /&gt;
| number    = 2973&lt;br /&gt;
| date      = August 16, 2024&lt;br /&gt;
| title     = Ferris Wheels&lt;br /&gt;
| image     = ferris_wheels_2x.png&lt;br /&gt;
| imagesize = 624x280px&lt;br /&gt;
| noexpand  = true&lt;br /&gt;
| titletext = They left the belt drive in place but switched which wheel was powered, so people could choose between a regular ride, a long ride, and a REALLY long ride.&lt;br /&gt;
}}&lt;br /&gt;
&lt;br /&gt;
==Explanation==&lt;br /&gt;
{{incomplete|Created by a BELT POWERED BY A DIFFERENT WIKI PAGE IN ORDER TO KEEP THIS ONE GOING - Please change this comment when editing this page. Do NOT delete this tag too soon.}}&lt;br /&gt;
&lt;br /&gt;
This comic depicts an attempted connection of three {{w|Ferris wheel}}s using a {{w|Belt (mechanical)|mechanical belt drive}}, a system typically used to transfer motion between rotating shafts. By connecting the wheels at different circumferences, the relative motion is geared up or down. If the belt passes around the circumference of one wheel and is connected around the hub of another, the latter will rotate significantly faster. In this case, the second wheel's circumference is in turn connected to a third wheel's hub, resulting in even greater rotational velocity. However, this setup is mechanically unsound and possibly dangerous, as Ferris wheels are not intended to be connected in this way.{{cn}} As shown, the first wheel on the left is running at a normal speed, while the other two are rotating increasingly fast, leading to a potentially hazardous situation where passengers are flung around at various (possibly {{w|G-force#Human tolerance|quite hazardous}}) extents.&lt;br /&gt;
&lt;br /&gt;
The typical Ferris wheel has a diameter of about 200 feet (60 m) and usually takes around 10 minutes per full rotation.{{acn}} The apparent ratio between the connected wheels in the comic is approximately 12.5:1, meaning the motion is significantly sped up as it’s transferred. The second Ferris wheel, driven by the first, could spin at around 1.3 rpm, with passengers moving at 9 mph (14 km/h), which is faster than usual but not inherently dangerous. However, when this motion is further transferred to the third Ferris wheel, it could spin at 16 rpm, with passengers traveling at over 110 mph (180 km/h), subjecting them to 8 Gs of force—conditions that would be hazardous.&lt;br /&gt;
&lt;br /&gt;
The caption says that the person responsible was fired for this ill-advised modification, highlighting the impracticality and dangers of the idea. A cruise line fired a person due to an unsound engineering solution earlier in [[2935: Ocean Loop]].&lt;br /&gt;
&lt;br /&gt;
The title text imagines the consequences of leaving the belt drive system in place but switching which wheel is powered. If the most extreme wheel (the third one on the right) is powered, the gearing would be reversed, making for a possibly pleasant and normal ride on the right-hand wheel, but rendering the experiences of the riders on the other two wheels far too slow and seemingly interminable. One revolution of the center wheel might take three hours and twenty minutes, while the left wheel would take multiple days per revolution. &amp;lt;!-- Based on the ratios above; I didn't do the intermediate math. Also, this wiki has comments? Neat! --&amp;gt; This exaggerates the impracticality and unintended effects of using a belt drive system on Ferris wheels, humorously illustrating how such an idea would lead to absurdly varied ride experiences.&lt;br /&gt;
&lt;br /&gt;
==Transcript==&lt;br /&gt;
{{incomplete transcript|Do NOT delete this tag too soon.}}&lt;br /&gt;
:[Three Ferris wheels are shown side by side, with some people stood on the ground for scale.]&lt;br /&gt;
:[Each of the first two wheels has a belt connecting its circumference to the axle of the wheel to its right.]&lt;br /&gt;
:[&amp;quot;Agitrons&amp;quot; indicate that the middle wheel is turning notably faster than the left wheel, with the gondolas seen to be rocking significantly at all points round the wheel.]&lt;br /&gt;
:[The spokes of the right wheel are completely replaced by &amp;quot;motion lines&amp;quot;, indicating that the the right wheel is turning the fastest of all. All its gondolas are hanging outwards against centripetal force, interspersed with their own motion lines.]&lt;br /&gt;
&lt;br /&gt;
:[Caption below the picture:]&lt;br /&gt;
:The county fair fired me for adding a belt drive to the Ferris wheels.&lt;br /&gt;
&lt;br /&gt;
{{comic discussion}}&lt;br /&gt;
[[Category:Physics]]&lt;br /&gt;
[[Category:Engineering]]&lt;/div&gt;</summary>
		<author><name>141.101.109.166</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=Talk:2972:_Helium_Synthesis&amp;diff=348678</id>
		<title>Talk:2972: Helium Synthesis</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=Talk:2972:_Helium_Synthesis&amp;diff=348678"/>
				<updated>2024-08-15T07:34:42Z</updated>
		
		<summary type="html">&lt;p&gt;141.101.109.166: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;&amp;lt;!--Please sign your posts with ~~~~ and don't delete this text. New comments should be added at the bottom.--&amp;gt;&lt;br /&gt;
&lt;br /&gt;
I had imagined that, rather than destroying the entire universe, they just somehow made a big bang INSIDE THE MACHINE that they could somehow obtain helium from safely. [[Special:Contributions/141.101.109.166|141.101.109.166]] 07:34, 15 August 2024 (UTC)&lt;/div&gt;</summary>
		<author><name>141.101.109.166</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=2969:_Vice_President_First_Names&amp;diff=348314</id>
		<title>2969: Vice President First Names</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=2969:_Vice_President_First_Names&amp;diff=348314"/>
				<updated>2024-08-07T18:47:19Z</updated>
		
		<summary type="html">&lt;p&gt;141.101.109.166: /* Explanation */ Remove duplicated open parentheses&lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;{{comic&lt;br /&gt;
| number    = 2969&lt;br /&gt;
| date      = August 7, 2024&lt;br /&gt;
| title     = Vice President First Names&lt;br /&gt;
| image     = vice_president_first_names_2x.png&lt;br /&gt;
| imagesize = 364x556px&lt;br /&gt;
| noexpand  = true&lt;br /&gt;
| titletext = [Political pundit on the ScrabbleTV News channel] &amp;quot;After four years of defying orthographic pressure, Joe ceded the top of the ticket to Kamala, who--after considering Josh, Mark, Andy, Roy, and Pete--picked Tim.&amp;quot;&lt;br /&gt;
}}&lt;br /&gt;
&lt;br /&gt;
==Explanation==&lt;br /&gt;
{{incomplete|Created by CORNELIUS LYSANDER THROCKMORTON &amp;quot;BOT&amp;quot; BOTTINGFORD - Please change this comment when editing this page. Do NOT delete this tag too soon.}}&lt;br /&gt;
&lt;br /&gt;
Randall implies that having an American {{w|Vice President of the United States|Vice President}} with a short first name is some sort of electoral precedent that was established in the 80s. Each yellow name since the 80s uses the shortened form of their first name (as with Joseph Robinette 'Joe' Biden). &lt;br /&gt;
&lt;br /&gt;
While not a &amp;quot;political consensus&amp;quot; per se, the observed phenomenom is also not simply a random coincidence. &lt;br /&gt;
* There has been a national trend toward shorter names since the 1980s and 1990s, with a rise in the popularity of baby names like Ryan, Kyle, Amy, and Lisa. (The trend has continued, with even shorter names like Ava, Mia, and Max becoming more common in the 2000s and 2010s.) &lt;br /&gt;
* This has paralleled a trend in shorter business names, with companies like Dell, Cisco, and eBay before the turn of the millennium and Google, Uber, and Lyft after. &lt;br /&gt;
* Product naming also began to simplify in the late 20th century, driven by marketing strategies that favored brevity and memorability, exemplified by Apple's iconic &amp;quot;iMac&amp;quot; and &amp;quot;iPhone&amp;quot; products. &lt;br /&gt;
So while the VPs on this list were all born before the mid-1980s, all of the VP names in yellow are intentionally shortened versions of longer given names, showing that each individual politician — trying to match the zeitgeist — happened to follow the popular preference for shorter names that emerged after the mid-80s.&lt;br /&gt;
&lt;br /&gt;
As the 2024 election had not yet concluded when this comic was made, both the Republican and Democratic tickets are present for 2024. Either party winning would still confirm the theory. JD Vance is a special sitation, since &amp;quot;JD&amp;quot; are his initials, but nonetheless represent how he now prefers to be addressed.&lt;br /&gt;
&lt;br /&gt;
This comic was published one day after {{w|Kamala Harris}} (who replaced Biden as presidential candidate) chose {{w|Tim Walz}} as her running mate for the {{w|2024 United States presidential election|2024 presidential election}}.&lt;br /&gt;
&lt;br /&gt;
The '''title text''' amusingly suggests (1) the existence of a ScrabbleTV News channel staffed with (2) political pundits who (3) report Biden's decision to end his re-election campaign as being driven by othographic (related to the writing of words) pressure to conform to the aforementioned political consensus. As long as Kamala was VP, this orthographic consensus was being violated. This could also be a subtle joke about political pundits tending to give confident, inaccurate hot-takes. (Biden's decision was driven, among other things, by worsening polling, a poor debate performance against Trump, and subsequent pressure from other leading Democrats.) &lt;br /&gt;
&lt;br /&gt;
The other Democratic vice presidental candidates mentioned were all considered to be the top six candidates during the final days before Harris's VP announcement of Tim Walz: Josh Shapiro, Mark Kelly, Andy Beshear, Roy Cooper, and Pete Buttigieg. (Other VP candidates with short names like JB Pritzker and Wes Moore were not among the final six.)&lt;br /&gt;
&lt;br /&gt;
This is Randall's second recent comic engaging in observational comedy about US politics and Kamala Harris, the first being #[[2962]] which was published right after she rose to the top of the Democratic ticket.&lt;br /&gt;
&lt;br /&gt;
===Trivia: Other ways to shorten names===&lt;br /&gt;
Politicians can also use a more casual name by employing their middle name (as with {{w|Mitt Romney|Willard Mitt Romney}}). Even when they're not shortened to four or fewer letters, names can be made more casual in other ways (as with {{w|Bernie Sanders|Bernard 'Bernie' Sanders}}). As well, some politicians were commonly called by short nicknames even if they did not run under those names (Dwight 'Ike' Eisenhower).&lt;br /&gt;
&lt;br /&gt;
{| class=&amp;quot;wikitable&amp;quot;&lt;br /&gt;
|+ Presidential Ticket Names&lt;br /&gt;
! Year !! President !! Vice-President&lt;br /&gt;
|-&lt;br /&gt;
| 2024 || Donald (John {{w|Donald Trump|Trump}}‎)&amp;lt;br /&amp;gt;Kamala (Devi {{w|Kamala Harris|Harris}}) || '''JD''' (''James David'' {{w|JD Vance|Vance}}, né James Donald Bowman)‎&amp;lt;br /&amp;gt;'''Tim''' (''Timothy'' {{w|Tim Walz|Walz}})&lt;br /&gt;
|-&lt;br /&gt;
| 2020 || '''Joe''' (''Joseph'' Robinette {{w|Joe Biden|Biden}} Jr.) || Kamala (Devi Harris)&lt;br /&gt;
|-&lt;br /&gt;
| 2016 || Donald (John Trump)‎ || '''Mike''' (''Michael'' Richard {{w|Mike Pence|Pence}})&lt;br /&gt;
|-&lt;br /&gt;
| 2012&amp;lt;br /&amp;gt;2008 || Barack (Hussein {{w|Barack Obama|Obama}} II)‎ || '''Joe''' (''Joseph'' Robinette Biden, Jr.)&lt;br /&gt;
|-&lt;br /&gt;
| 2004&amp;lt;br /&amp;gt;2000 || George (Walker {{w|George W. Bush|Bush}}) || '''Dick''' (''Richard'' Bruce {{w|Dick Cheney|Cheney}})&lt;br /&gt;
|-&lt;br /&gt;
| 1996&amp;lt;br /&amp;gt;1992 || '''Bill''' (''William'' Jefferson {{w|Bill Clinton|Clinton}}, né W. J. Blythe III) || '''Al''' (''Albert'' Arnold {{w|Al Gore|Gore}} Jr.)&lt;br /&gt;
|-&lt;br /&gt;
| 1988 || George (Herbert Walker {{w|George H. W. Bush|Bush}})‎ || '''Dan''' (James ''Danforth'' {{w|Dan Quayle|Quayle}} )&lt;br /&gt;
|-&lt;br /&gt;
| 1984&amp;lt;br /&amp;gt;1980 || Ronald (Wilson {{w|Ronald Reagan|Reagan}})‎ || George (Herbert Walker Bush)&lt;br /&gt;
|-&lt;br /&gt;
| 1976 || ‎Jimmy (''James'' Earl {{w|Jimmy Carter|Carter}} Jr.) || Walter (Frederick {{w|Walter Mondale|Mondale}})&lt;br /&gt;
|-style=&amp;quot;background-color:lightgray&amp;quot;&lt;br /&gt;
| 1974 || ‎Gerald (Rudolph {{w|Gerald Ford|Ford}} Jr, né Leslie Lynch King Jr.) || Nelson (Aldrich {{w|Nelson Rockefeller|Rockefeller}})*&lt;br /&gt;
|-style=&amp;quot;background-color:lightgray&amp;quot;&lt;br /&gt;
| 1973 || ‎Richard (Milhous {{w|Richard Nixon|Nixon}}) || Gerald (Rudolph Ford Jr.)*&lt;br /&gt;
|-&lt;br /&gt;
| 1972&amp;lt;br /&amp;gt;1968 || ‎Richard (Milhous Nixon) || Spiro (Theodore {{w|Spiro Agnew|Agnew}})&lt;br /&gt;
|-&lt;br /&gt;
| 1964 || Lyndon (Baines {{w|Lyndon B. Johnson|Johnson}}) || Hubert (Horatio {{w|Hubert Humphrey|Humphrey}} Jr.)&lt;br /&gt;
|-style=&amp;quot;background-color:lightgray&amp;quot;&lt;br /&gt;
| 1963 || Lyndon (Baines Johnson)† || ''vacant''&lt;br /&gt;
|-&lt;br /&gt;
| 1960 || '''John''' (Fitzgerald {{w|John F. Kennedy|Kennedy}})  || Lyndon (Baines Johnson)&lt;br /&gt;
|-&lt;br /&gt;
| 1956&amp;lt;br /&amp;gt;1952 || Dwight (David {{w|Dwight D. Eisenhower|Eisenhower}}, né David Dwight Eisenhower)  || Richard (Milhous Nixon)&lt;br /&gt;
|}&lt;br /&gt;
&lt;br /&gt;
:Darkened rows show transitions not made via an {{w|List of United States major party presidential tickets|electoral 'ticket'}}.&lt;br /&gt;
::''* Replacements made in response to political scandal''&lt;br /&gt;
::''† Accession to Presidency due to assassination, VP position left unfilled until next election (not shown in comic)''&lt;br /&gt;
&lt;br /&gt;
==Transcript==&lt;br /&gt;
{{incomplete transcript|Tables are bad? Do NOT delete this tag too soon.}}&lt;br /&gt;
&lt;br /&gt;
:[A table is shown in a panel. Names of &amp;quot;Four letters or fewer&amp;quot; are shown in the comic on a yellow background (bolded in the table below).]&lt;br /&gt;
:{| class=&amp;quot;wikitable&amp;quot;&lt;br /&gt;
! !! President !! VP&lt;br /&gt;
|-&lt;br /&gt;
| 2024 ||? Kamala&amp;lt;br /&amp;gt;? Donald || '''Tim ?&amp;lt;br /&amp;gt;JD ?'''&lt;br /&gt;
|-&lt;br /&gt;
| 2020 || '''Joe''' || Kamala&lt;br /&gt;
|-&lt;br /&gt;
| 2016 || Donald‎ || '''Mike'''&lt;br /&gt;
|-&lt;br /&gt;
| 2008 || Barack‎ || '''Joe'''&lt;br /&gt;
|-&lt;br /&gt;
| 2000 || George || '''Dick'''&lt;br /&gt;
|-&lt;br /&gt;
| 1992 || '''Bill''' || '''Al'''&lt;br /&gt;
|-&lt;br /&gt;
| 1988 || George || '''Dan'''&lt;br /&gt;
|-&lt;br /&gt;
| 1980 || Ronald‎ || George&lt;br /&gt;
|-&lt;br /&gt;
| 1976 || ‎Jimmy || Walter&lt;br /&gt;
|-&lt;br /&gt;
| 1974 || ‎Gerald || Nelson&lt;br /&gt;
|-&lt;br /&gt;
| 1973 || ‎Richard || Gerald&lt;br /&gt;
|-&lt;br /&gt;
| 1968 || ‎Richard || Spiro&lt;br /&gt;
|-&lt;br /&gt;
| 1964 || Lyndon || Hubert&lt;br /&gt;
|-&lt;br /&gt;
| 1960 || '''John''' || Lyndon&lt;br /&gt;
|-&lt;br /&gt;
| 1952 || Dwight || Richard&lt;br /&gt;
|}&lt;br /&gt;
&lt;br /&gt;
:[Caption below the panel:]&lt;br /&gt;
:Since the 1980s, a political consensus has emerged: vice presidents should have short first names.&lt;br /&gt;
&lt;br /&gt;
{{comic discussion}}&lt;br /&gt;
&lt;br /&gt;
[[Category:Comics with color]]&lt;br /&gt;
[[Category:Politics]]&lt;br /&gt;
[[Category:Elections]]&lt;br /&gt;
[[Category:Comics featuring politicians]]&lt;/div&gt;</summary>
		<author><name>141.101.109.166</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=Talk:2952:_Routine_Maintenance&amp;diff=345296</id>
		<title>Talk:2952: Routine Maintenance</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=Talk:2952:_Routine_Maintenance&amp;diff=345296"/>
				<updated>2024-06-29T05:46:11Z</updated>
		
		<summary type="html">&lt;p&gt;141.101.109.166: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;&amp;lt;!--Please sign your posts with ~~~~ and don't delete this text. New comments should be added at the bottom.--&amp;gt;&lt;br /&gt;
&lt;br /&gt;
Ooooh, if this were only true... All the &amp;quot;Nobody tells me what to do&amp;quot; stubborn people would have died out years ago, and Covid would have been a LOT shorter! :) Added an initial explanation, all I found here was a basic transcript.&lt;br /&gt;
&lt;br /&gt;
The vent off of Alaska is poking out, is there a volcano around there? Feels a little north to be Mount Fuji, but I have a suspicion most if not all are supposed to be actually volcanos... [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:12, 29 June 2024 (UTC)&lt;br /&gt;
:Russia's Kamchatka Peninsula (the long &amp;quot;teardrop&amp;quot; hanging below the Siberian Peninsula) is very volcanically active. The others look like reasonable places to expect volcanoes - I've added a couple of lines. [[Special:Contributions/172.68.64.207|172.68.64.207]] 05:25, 29 June 2024 (UTC)&lt;br /&gt;
&lt;br /&gt;
Is the image SUPPOSED to be that tiny? It's not even 800 pixels!  [[Special:Contributions/141.101.109.166|141.101.109.166]] 05:46, 29 June 2024 (UTC)&lt;/div&gt;</summary>
		<author><name>141.101.109.166</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=1081:_Argument_Victory&amp;diff=344290</id>
		<title>1081: Argument Victory</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=1081:_Argument_Victory&amp;diff=344290"/>
				<updated>2024-06-13T11:17:01Z</updated>
		
		<summary type="html">&lt;p&gt;141.101.109.166: Rephrased to read better&lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;{{comic&lt;br /&gt;
| number    = 1081&lt;br /&gt;
| date      = July 13, 2012&lt;br /&gt;
| title     = Argument Victory&lt;br /&gt;
| image     = argument victory.png&lt;br /&gt;
| titletext = Really, the comforting side in most conspiracy theory arguments is the one claiming that anyone who's in power has any plan at all.&lt;br /&gt;
}}&lt;br /&gt;
&lt;br /&gt;
==Explanation==&lt;br /&gt;
[[Cueball]] is arguing with a {{w|conspiracy theorist}} who believes in some {{rw|conspiracy}}, who is sitting in front of his computer talking back. They are probably using {{w|Skype}}, {{w|FaceTime}}, or another video calling service, as Cueball later asks him to watch closely, holding his phone up to show the other guy what he is doing. &lt;br /&gt;
&lt;br /&gt;
Cueball's opponent seems to ignore all reliable sources, like {{w|Snopes}} and {{w|Wikipedia}} on top of several {{w|Academic journal|journals}}, instead preferring sources that are seemingly not credible (but that do agree with him). These conspiracy &amp;quot;.net&amp;quot; pages typically just have a black background and use several different sizes of fonts. Their belief seems to be the larger the font(and the brighter the colors, possibly), the more convincing. Cueball cannot take these kinds of sources seriously. &amp;quot;.net&amp;quot; websites can be made by anyone and have little limitations. The maker of a &amp;quot;.net&amp;quot; does not need to show sources of information or even their name. As such, &amp;quot;.net&amp;quot; websites are notoriously unreliable.&lt;br /&gt;
[http://zapatopi.net/blackhelicopters/ The Truth about Black Helicopters] is a (satirical) example of one such website, supposedly explaining the truth behind government &amp;quot;Black Helicopters&amp;quot;.&lt;br /&gt;
 &lt;br /&gt;
The conspiracy theorist insists that by trusting reliable sources, Cueball is simply buying into the cover-up, suggesting that all those journalists are somehow brainwashed. Cueball says he can win the argument, and will show him how, but then ceases to argue further in favor of going down a {{w|waterslide}} while holding up the phone to show the other guy how to have a good time. Since conspiracy theorists tend to be [[wikt:intransigent|intransigent]], Cueball sees himself as the victor after ceasing to argue with a guy who cannot be argued with, and instead decides to have some fun. This is made even more satisfying for Cueball by the fact that it makes his opponent angry. It's likely that this is also a reference to the ''[https://knowyourmeme.com/memes/your-argument-is-invalid &amp;quot;Your Argument is Invalid&amp;quot;]'' meme.&lt;br /&gt;
&lt;br /&gt;
The joke here is also in the title of the comic which is ''[http://imgur.com/EKkAXgR Argument Victory]'' something that is very hard to achieve by on the web... Cueball won this victory not by arguing but by stopping this argument he was having with someone that could/would not be argued with, such as going down a waterslide.&lt;br /&gt;
&lt;br /&gt;
The title text points out that belief in a conspiracy presupposes that those with the power to carry out the conspiracy actually have a plan, a situation which might be found more &amp;quot;comforting&amp;quot; than the alternative that those in power are just muddling through with no plan at all. This concept is revisited in [[1274: Open Letter]].&lt;br /&gt;
&lt;br /&gt;
==Transcript==&lt;br /&gt;
:[Cueball, looking right, is talking at his smartphone while holding it up in front of his head using both hands.]&lt;br /&gt;
:Cueball: I can't believe you're so wrong. I'm backed by Snopes, Wikipedia, and a half-dozen journals. You're citing .net pages with black backgrounds and like 20 fonts each.&lt;br /&gt;
&lt;br /&gt;
:[A conspiracy theorist is sitting in front of this lap top at his desk looking left. He has his hair combed down. He is talking to Cueball via his laptop, probably Skyping.]&lt;br /&gt;
:Conspiracy theorist: It's sad how you buy into the official story so unquestioningly. &lt;br /&gt;
:Conspiracy theorist: Guess some people ''prefer'' to stay asleep.&lt;br /&gt;
&lt;br /&gt;
:[Back to Cueball who has lowered his phone a bit. The reply from the conspiracy theorist is shown to come out of the phone with a jagged arrow and likewise speech bubble.]&lt;br /&gt;
:Cueball: Watch closely— I'm about to win this argument.&lt;br /&gt;
:Conspiracy theorist (reply from phone): How?&lt;br /&gt;
&lt;br /&gt;
:[Cueball is sitting at the very top of a waterslide preparing to descend.]&lt;br /&gt;
:Cueball: By ''going down a waterslide''.&lt;br /&gt;
&lt;br /&gt;
:[A split panel, with a close-up of the conspiracy theorist above and below Cueball is sliding down the waterslide with both hands above his head, water splashing up behind him as he holds his smartphone above the water in one hand.]&lt;br /&gt;
:Conspiracy theorist: So? What does that prove?&lt;br /&gt;
:Cueball: ''Wheee..''&lt;br /&gt;
&lt;br /&gt;
:[Another split panel, this time a smaller part is used for the close-up of the conspiracy theorist above and below Cueball has more of this panels space for sliding down to the bottom of the waterslide with both hands above his head, water still splashing up behind him as he continues to keep his smartphone above the water in one hand.]&lt;br /&gt;
:Conspiracy theorist: You didn't win the argument!&lt;br /&gt;
:Cueball: ''...eeee!''&lt;br /&gt;
:Cueball: ''Sploosh!''&lt;br /&gt;
&lt;br /&gt;
{{comic discussion}}&lt;br /&gt;
&lt;br /&gt;
[[Category:Comics featuring Cueball]]&lt;br /&gt;
[[Category:Conspiracy theory]]&lt;br /&gt;
[[Category:Wikipedia]]&lt;br /&gt;
[[Category:Internet]]&lt;br /&gt;
[[Category:Cognitive Bias]]&lt;/div&gt;</summary>
		<author><name>141.101.109.166</name></author>	</entry>

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