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		<id>https://www.explainxkcd.com/wiki/api.php?action=feedcontributions&amp;feedformat=atom&amp;user=172.70.214.252</id>
		<title>explain xkcd - User contributions [en]</title>
		<link rel="self" type="application/atom+xml" href="https://www.explainxkcd.com/wiki/api.php?action=feedcontributions&amp;feedformat=atom&amp;user=172.70.214.252"/>
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		<updated>2026-04-17T08:46:40Z</updated>
		<subtitle>User contributions</subtitle>
		<generator>MediaWiki 1.30.0</generator>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=Category_talk:Rhythm_Games&amp;diff=308442</id>
		<title>Category talk:Rhythm Games</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=Category_talk:Rhythm_Games&amp;diff=308442"/>
				<updated>2023-03-13T07:13:05Z</updated>
		
		<summary type="html">&lt;p&gt;172.70.214.252: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;Should &amp;quot;Rolling Sky&amp;quot; (I'm afraid it's probably banned in your country) be considered a [[:Category:Rhythm_Games|rhythm game]]? {{citation needed}} [[User:ColorfulGalaxy|ColorfulGalaxy]] ([[User talk:ColorfulGalaxy|talk]]) 08:45, 13 December 2022 (UTC)&lt;/div&gt;</summary>
		<author><name>172.70.214.252</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=Talk:2719:_Hydrogen_Isotopes&amp;diff=303910</id>
		<title>Talk:2719: Hydrogen Isotopes</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=Talk:2719:_Hydrogen_Isotopes&amp;diff=303910"/>
				<updated>2023-01-03T02:27:35Z</updated>
		
		<summary type="html">&lt;p&gt;172.70.214.252: can someone draw rule 34 of the female xkcd characters pls&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;
This shows as a 404 on xkcd.com but in my RSS feed i can see the comic&lt;br /&gt;
: Works for me. [[Special:Contributions/172.69.34.9|172.69.34.9]] 02:25, 3 January 2023 (UTC)&lt;br /&gt;
::works for me now too but it didnt before&lt;/div&gt;</summary>
		<author><name>172.70.214.252</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=Talk:2719:_Hydrogen_Isotopes&amp;diff=303902</id>
		<title>Talk:2719: Hydrogen Isotopes</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=Talk:2719:_Hydrogen_Isotopes&amp;diff=303902"/>
				<updated>2023-01-03T02:13:47Z</updated>
		
		<summary type="html">&lt;p&gt;172.70.214.252: /* 404? */ new section&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;
== 404? ==&lt;br /&gt;
&lt;br /&gt;
this shows as a 404 on xkcd.com but in my RSS feed i can see the comic&lt;/div&gt;</summary>
		<author><name>172.70.214.252</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=Talk:2705:_Spacetime_Soccer&amp;diff=300191</id>
		<title>Talk:2705: Spacetime Soccer</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=Talk:2705:_Spacetime_Soccer&amp;diff=300191"/>
				<updated>2022-12-02T01:15:41Z</updated>
		
		<summary type="html">&lt;p&gt;172.70.214.252: &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;
Wow, that was fast {{unsigned ip|172.70.131.8|03:48, 1 December 2022‎}}&lt;br /&gt;
:What was? [[Special:Contributions/172.70.162.46|172.70.162.46]] 04:27, 1 December 2022 (UTC)&lt;br /&gt;
Does someone want to point out to Randall that it is the offside rule, not offsides rule [[Special:Contributions/172.70.134.122|172.70.134.122]] 04:57, 1 December 2022 (UTC)&lt;br /&gt;
:It's often pluralized in American English, per Wikipedia: https://en.m.wikipedia.org/wiki/Offside_(sport) [[Special:Contributions/172.71.151.44|172.71.151.44]] 05:22, 1 December 2022 (UTC)&lt;br /&gt;
:That makes no sense, it's an adjective, not a noun. It can't be pluralised. Even that wikipedia article, despite its assertion at the top, doesn't at any point use &amp;quot;offside&amp;quot; as a noun.&lt;br /&gt;
::Side is a noun. It's colloquial in the US because other games use the same word. [[Special:Contributions/172.70.206.92|172.70.206.92]] 12:03, 1 December 2022 (UTC)&lt;br /&gt;
:::Interesting that the inherent pluralisation doesn't extend to &amp;quot;math(ematic)s&amp;quot;... ;) [[Special:Contributions/172.70.86.61|172.70.86.61]] 12:27, 1 December 2022 (UTC)&lt;br /&gt;
:I can only imagine that Randall used the less-preferred (more-despised?) term to troll some of us.  Does he not like the beautiful game? [[Special:Contributions/172.70.214.252|172.70.214.252]] 01:15, 2 December 2022 (UTC)&lt;br /&gt;
I currently have no time to expand the explanation, but it should be pointed out that the gravity well drawing is a graph and not an actual surface. Also, people are perfectly fine with moving though 4 dimensional spacetime. We do it every day. [[User:Condor70|Condor70]] ([[User talk:Condor70|talk]]) 09:19, 1 December 2022 (UTC)&lt;br /&gt;
[citation needed] [[Special:Contributions/198.41.242.83|198.41.242.83]] 09:59, 1 December 2022 (UTC)&lt;br /&gt;
:...though note that I probably can't ever go back to where I was yesterday. [[Special:Contributions/172.70.86.61|172.70.86.61]] 12:27, 1 December 2022 (UTC)&lt;br /&gt;
::That has more to do with the fact that you flooded the museum's basement than spacetime though [[Special:Contributions/172.69.22.62|172.69.22.62]] 15:24, 1 December 2022 (UTC)&lt;br /&gt;
:::I did not! I flooded their second floor. It was ''their'' fault that the basement subsequently flooded (and gained a few new items/display cases/members of staff and also an improved influx of visitors to the &amp;quot;Dried Goods Through The Ages&amp;quot; exhibit that they already kept down there), but they still blamed me for some strange and probably erroneous reason... [[Special:Contributions/162.158.159.30|162.158.159.30]] 16:36, 1 December 2022 (UTC)&lt;br /&gt;
&lt;br /&gt;
I'm pretty sure it mocks the fact that in the rest of the world, &amp;quot;football&amp;quot; is the sport where you play the ball with your *feet*, with a particular obscure rule that you can't touch it with your hands (unless you are a goalkeeper). On the other hand, American &amp;quot;football&amp;quot; is the sport where you grab the ball with your hands and carry it around. [[Special:Contributions/172.71.160.43|172.71.160.43]] 16:35, 1 December 2022 (UTC)&lt;br /&gt;
&lt;br /&gt;
haha...I thought there actually was ''[more]'' [[Special:Contributions/172.71.182.155|172.71.182.155]] 22:10, 1 December 2022 (UTC)&lt;/div&gt;</summary>
		<author><name>172.70.214.252</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=2702:_What_If_2_Gift_Guide&amp;diff=299797</id>
		<title>2702: What If 2 Gift Guide</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=2702:_What_If_2_Gift_Guide&amp;diff=299797"/>
				<updated>2022-11-24T23:02:12Z</updated>
		
		<summary type="html">&lt;p&gt;172.70.214.252: /* Explanation */ links&lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;{{comic&lt;br /&gt;
| number    = 2702&lt;br /&gt;
| date      = November 23, 2022&lt;br /&gt;
| title     = What If 2 Gift Guide&lt;br /&gt;
| image     = what_if_2_gift_guide_2x.png&lt;br /&gt;
| imagesize = 500x878px&lt;br /&gt;
| noexpand  = true&lt;br /&gt;
| titletext = BABIES OR LITERATURE BUT NOT BOTH: Baby shoes&lt;br /&gt;
}}&lt;br /&gt;
&lt;br /&gt;
==Explanation==&lt;br /&gt;
{{incomplete|Created by an OUT-OF-CONTROL HANDHELD NEUTRINO CYLINDER FOR TEENS. Do NOT delete this tag too soon.}}&lt;br /&gt;
&lt;br /&gt;
[[Randall Munroe]], author of xkcd, is promoting his new book, ''[https://xkcd.com/what-if-2/ What if? 2]''. He also suggests some other gift ideas, most of which are dangerous or impractical. Many reference past xkcd cartoons. &lt;br /&gt;
&lt;br /&gt;
{| class=&amp;quot;wikitable&amp;quot;&lt;br /&gt;
|+ &lt;br /&gt;
|-&lt;br /&gt;
! Interest !! Gift Idea !! Explanation&lt;br /&gt;
|-&lt;br /&gt;
| Engineering || The {{w|International Prototype of the Kilogram|platinum cylinder}} formerly used to identify the kilogram || This is an object of historical relevance of which only six exist, making it a very expensive or illegal gift. With the {{w|2019 redefinition of the SI base units|redefinition of the SI base units}} in 2019, {{w|2019_redefinition_of_the_SI_base_units#Kilogram|the kilogram}} is now defined using only natural constants rather than a physical standard. It took some time before this last SI unit was redefined, but that is now 3 years past at the time of this comic's release, so it is not news. The old prototypes are no longer as valuable as they were when they were actually used to define the kilogram. But they are still historical artifacts with enormous value, even apart from the value of a  kilogram of platinum (about $32 000 at time of writing).&lt;br /&gt;
|-&lt;br /&gt;
| Biology     || The genomes of the scientists who headed the human genome project || The &amp;quot;International Human Genome Sequencing Consortium,&amp;quot; as the {{w|Human Genome Project}} team was known, involved scientists from twenty institutions in six countries. In the US, it was initially led by DNA structure co-discoverer {{w|James Watson}} who was succeeded by {{w|Francis Collins}}. In the UK, the project was led by {{w|John Sulston}}. The teams from other countries' institutions were less prominent and performed substantially less work on the initial sequencing. James Watson's genome was sequenced in 2007. The genome of {{w|Craig Ventor}}, the CEO of {{w|Celera Genomics}}, was used as the exemplar for Celera’s sequence. While the “race” between Celera and NIH was declared a tie by then-President Clinton, in actuality, Celera had some 85+% coverage while NIH was about 50%. &lt;br /&gt;
|-&lt;br /&gt;
| Physics     || A beam of neutrinos delivered through the earth by the LHC || [https://en.wikipedia.org/wiki/Neutrino Neutrinos] interact very weakly with other particles, to the point that they almost always pass straight through matter completely unaffected. This means that particle accelerators can send neutrinos to any other point on Earth by aiming the particle beam into the ground, and the neutrinos pass straight through the Earth. This point is referenced in [https://what-if.xkcd.com/73/ What If? 73]. The low interactivity of neutrinos would also mean that the recipient would be unable to perceive their gift, making this a poor present for anyone except the small proportion of physics aficionados who already have a neutrino detector on-hand.&lt;br /&gt;
|-&lt;br /&gt;
| Animals     || Surprise wildlife encounter (gift-wrapped box with a bobcat inside) || This is a reference to [https://www.explainxkcd.com/wiki/index.php/Category:Bobcats xkcd's rich history of mailing boxed bobcats to people]. This gift would place the recipient in a perilous situation, and, although definitely a wildlife encounter, is not a good gift{{Citation needed}}.&lt;br /&gt;
|-&lt;br /&gt;
| Law         || A vacation to that area of Idaho where you can commit crimes with impunity due to a court district boundary error || This refers to the [https://en.wikipedia.org/wiki/Zone_of_Death_(Yellowstone) &amp;quot;Zone of Death&amp;quot;], a 50-square-mile area of Yellowstone National Park that is in the physical boundaries of Idaho, but in the legal jurisdiction of Wyoming. Because a jury in the United States must be composed of residents of the same district ''and'' state in which the crime was committed, but no one lives in this small area of a National Park, anyone who committed a crime here could not possibly receive a trial, and thus could not legally be punished for said crime in any circumstance. This is an interesting legal loophole, but going to this area does not provide any more value than hearing about it, and could scare your law-enthusiast friend.&lt;br /&gt;
|-&lt;br /&gt;
| Chemistry   || A necklace of element samples whose symbols spell out the recipient's name (note: names like &amp;quot;Katherine&amp;quot; and &amp;quot;Brandon&amp;quot; may cause radiation accidents.) || Novelty necklaces are a common and innocuous gift, and using element symbols in place of the same letter is a common gimmick, such as in the title of Breaking Bad. However, making an object out of whatever element sample corresponds to someone's name could have unpredictable results - some elements in their pure form are too brittle or have too low a melting point for such an application, and some are unsafe. &amp;quot;Katherine&amp;quot; would be made from Potassium (highly reactive), Astatine (rare, '''radioactive''' and has a short half-life), Hydrogen (gaseous at room temperature, flammable), Erbium, Iodine (sublimes into a gas at room temperature), and Neon (gaseous at room temperature). &amp;quot;Brandon&amp;quot; would be made from Boron, Radium ('''radioactive'''), Neodymium, Oxygen (gaseous at room temperature), and Nitrogen (gaseous at room temperature).  The problems with element samples could be partially alleviated by allowing compounds rather than pure elements, but the radioactivity would still be a problem, and neon does not form compounds and as such is always gaseous. Additionally, the letter Q does not appear in the periodic table symbols, so a name like Quinn would be problematic.&lt;br /&gt;
|-&lt;br /&gt;
| Puzzles     || Two goats and a new car || This is a reference to the the [https://en.wikipedia.org/wiki/Monty_Hall_problem &amp;quot;Monty Hall problem&amp;quot;], in which a game show contestant can win only one of the three items. (See [[1282: Monty Hall]] for another cartoon inspired by this problem.) This gift places the recipient within a puzzle which is typically discussed hypothetically, rather than happening in real life. Although a new car is a ''great'' gift, goats are only useful to people with specific professions. &lt;br /&gt;
The problem that the recipient would have would likely be how to transport the two goats - it'd be difficult to fit both into a compact car at once, but one can't be left behind unattended.&lt;br /&gt;
|-&lt;br /&gt;
| Technology  || Cybiko® wireless handheld computer for teens (2000) || This device was referenced in [https://xkcd.com/2699/ one of last week's comics], so Randall seems to have a temporary fixation on it. While an interesting example of the history of communication technology and coming from a time when experimentation was common and standards were few, it isn't very useful now, because it is no longer supported, has a communication range of 100 meters (sending text messages via radio) and one can only use it to communicate with users of the same device. However, technology enthusiasts could find it interesting as a collectors' item, so by all means it is one of the most plausible gift ideas on this list.&lt;br /&gt;
|-&lt;br /&gt;
| Space       || Webb telescope personal photoshoot || The Webb telescope belongs to NASA, the ESA and the CSA, and is currently very far from Earth. It is designed to capture distant space objects in previously unseen detail. It is not designed to photograph nearby objects of human size, assuming that that is what photoshoot implies. These circumstances make it both an impossible and impractical gift. Furthermore, unless the recipient of the gift is able to travel a long way from Earth, Webb would have to point at the warm Earth and expose its optics to the Sun, permanently crippling the telescope. [https://webb.nasa.gov/content/about/faqs/faqLite.html This is forbidden by NASA.]&lt;br /&gt;
&lt;br /&gt;
On the other hand, a gift experience of being allowed to to take your own snapshot of Webb in position, perhaps with a [https://www.dailymail.co.uk/sciencetech/article-10442913/James-Webb-Space-Telescope-seen-Earth-settles-orbit.html robotic telescope], might be an attractive gift to a space enthusiast! So might a chance to use the Webb telescope to take pictures of whatever celestial objects one chooses, as time on the Webb telescope is very carefully allocated.&lt;br /&gt;
|-&lt;br /&gt;
| Literature  || Stephen King's writing desk (he's still using it so you'll have to fight him) || {{w|Stephen King}} is an author lucky enough to have legendary status while still alive. The desk of an author that has died would become an object of historic significance and would likely be either kept for exhibition or auctioned by their respective estate, but as Stephen King still writes, his desk, while valuable, cannot be subjected to the same.&lt;br /&gt;
|-&lt;br /&gt;
| Philosophy  || Out-of-control trolley || This is another gift that places the recipient in the situations that they like discussing hypothetically. This refers to the {{w|trolley problem}}, which places stress on the person forced to make the decision, and exists to make them examine their morals. Facing someone with the hypothetical problem is already not a good gift, but [https://www.youtube.com/watch?v=1sl5KJ69qiA forcing them to live through it in real life] is a terrible gift. (See [[1455: Trolley Problem]] for another cartoon inspired by this problem.)&lt;br /&gt;
|-&lt;br /&gt;
| Psychology  || A nice gift with a note saying you don't expect anything in return || This is perhaps the most viable option on this list. This kind of gift giving could induce the Benjamin Franklin effect, causing the gift giver to like the recipient more. It could also be used to manipulate the recipient by increasing pressure to reciprocate. This would cause them stress, making it a bad gift, but a psychologist would hopefully understand it to be a joke.  &lt;br /&gt;
|-&lt;br /&gt;
| (Title text) Babies or literature but not both || Baby shoes || This is a reference to the six-word story [https://en.wikipedia.org/wiki/For_sale:_baby_shoes,_never_worn For sale: baby shoes, never worn] which is often attributed to Ernest Hemingway. Someone with babies, such as expecting or new parents would find baby shoes as a valuable gift for their child. Someone interested in literature would see the reference to a famous work. But someone who understands the reference would possibly also be sad if they simultaneously actually enjoyed babies or have children of their own (since the story implies the seller was expecting a baby but there was an accident).&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;
What If? 2 Gift Guide&lt;br /&gt;
&lt;br /&gt;
What if? 2 makes a good gift for anyone who's into science, absurd ideas, or just the universe in general. To order, go to xkcd.com/whatif2, or just type &amp;quot;what if 2&amp;quot; into some random box on your device; it will probably work.&lt;br /&gt;
&lt;br /&gt;
Here are some other gift ideas for hard-to-shop-for science enthusiasts:&lt;br /&gt;
&lt;br /&gt;
Interest  -  Gift Idea&lt;br /&gt;
&lt;br /&gt;
Engineering  -  The platinum cylinder formerly used to define the kilogram&amp;lt;br/&amp;gt;&lt;br /&gt;
Biology  -  The genomes of the scientists who headed the human genome project&amp;lt;br/&amp;gt;&lt;br /&gt;
Physics  -  A beam of neutrinos delivered through the earth by the LHC&amp;lt;br/&amp;gt;&lt;br /&gt;
Animals  -  Surprise wildlife encounter (gift-wrapped box with a bobcat inside)&amp;lt;br/&amp;gt;&lt;br /&gt;
Law  -  A vacation to that area of Idaho where you can commit crimes with impunity due to a court district boundary error&amp;lt;br/&amp;gt;&lt;br /&gt;
Chemistry  -  A necklace of element samples whose symbols spell out the recipient's name (note: names like &amp;quot;Katherine&amp;quot; and &amp;quot;Brandon&amp;quot; may cause radiation accidents.)&amp;lt;br/&amp;gt;&lt;br /&gt;
Puzzles  -  Two goats and a new car&amp;lt;br/&amp;gt;&lt;br /&gt;
Technology  -   Cybiko® Wireless Handheld Computer for Teens (2000)&amp;lt;br/&amp;gt;&lt;br /&gt;
Space  -  Webb telescope personal photoshoot&amp;lt;br/&amp;gt;&lt;br /&gt;
Literature  -  Stephen King's writing desk (he's still using it so you'll have to fight him)&amp;lt;br/&amp;gt;&lt;br /&gt;
Philosophy  -  Out-of-control trolley&amp;lt;br/&amp;gt;&lt;br /&gt;
Psychology  -  A nice gift with a note saying you don't expect anything in return.&amp;lt;br/&amp;gt;&lt;br /&gt;
&lt;br /&gt;
{{comic discussion}}&lt;br /&gt;
&lt;br /&gt;
[[Category:Book promotion]]&lt;br /&gt;
[[Category:Bobcats]]&lt;/div&gt;</summary>
		<author><name>172.70.214.252</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=Talk:2699:_Feature_Comparison&amp;diff=298948</id>
		<title>Talk:2699: Feature Comparison</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=Talk:2699:_Feature_Comparison&amp;diff=298948"/>
				<updated>2022-11-17T19:41:07Z</updated>
		
		<summary type="html">&lt;p&gt;172.70.214.252: Uhhh&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;
The image has changed. Now Mastodon includes USER-RUN INSTANCES (though I believe it should also have a check next to DOESN'T REQUIRE CENTRAL SERVER).&lt;br /&gt;
&lt;br /&gt;
I tried googling &amp;quot;wikipedia feature comparison chart&amp;quot;. Instead of finding a page explaining how these charts work, I got a chart comparing different wiki softwares. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 23:22, 16 November 2022 (UTC)&lt;br /&gt;
&lt;br /&gt;
Of course, it wouldn't be hard to make apps on smartphones support mesh networks ... however, the manufacturers and app developers prefer to work hard to make sure they don't work without being connected to internet and serving advertisement. [https://en.wikipedia.org/wiki/Wi-Fi_Direct Although ...] -- [[User:Hkmaly|Hkmaly]] ([[User talk:Hkmaly|talk]]) 00:25, 17 November 2022 (UTC)&lt;br /&gt;
&lt;br /&gt;
There seems to be a lot of wrongness about this matrix. Besides that mastodon instances can be run by user (which is fixed):&lt;br /&gt;
* Mastodon does not support file transfer. You can only upload images, and ''not'' even all image formats—webp is not supported. Some other ActivityPub servers support file upload, but then it's not Mastodon.&lt;br /&gt;
* IRC also doesn't support file transfer afaik.&lt;br /&gt;
* Mastodon and SMS don't require a central server&lt;br /&gt;
* Discord, Reddit, and Slack doesn't have user-run instances&lt;br /&gt;
* Discord doesn't have builtin games last time I checked. The games are by the bots,&lt;br /&gt;
&lt;br /&gt;
I don't know about Slack, but pretty much all of Discord and Reddit is user-run/moderated instances.&lt;br /&gt;
:That slash is doing a lot of work there. [[Special:Contributions/172.69.34.31|172.69.34.31]] 06:57, 17 November 2022 (UTC)&lt;br /&gt;
:Your definition for &amp;quot;instance&amp;quot; must be very different from mine then. For me, &amp;quot;instance&amp;quot; refer to the server software's instance; that is, the user must be able to run the server software on their own to qualify this. If you consider subreddits and discord chat rooms (I refuse to call them &amp;quot;servers&amp;quot;, because that's not what they are) as &amp;quot;user-run instances&amp;quot;, then so are Facebook groups, right? Those are not instances; they're just communities or groups moderated by some selected people. --[[Special:Contributions/172.71.215.3|172.71.215.3]] 12:55, 17 November 2022 (UTC)&lt;br /&gt;
&lt;br /&gt;
&amp;quot;IRC itself is a teleconferencing system, which (through the use of the client-server model) is well-suited to running on many machines in a distributed fashion. A typical setup involves a single process  '''(the server) forming a central point''' for clients (or other servers) to connect to, performing the required message delivery/multiplexing and other functions.&amp;quot; – J. Oikarinen, D. Reed; Internet Relay Chat Protocol; RFC 1459; May 1993. Emphasis added. [[Special:Contributions/172.71.154.158|172.71.154.158]] 01:45, 17 November 2022 (UTC)&lt;br /&gt;
&lt;br /&gt;
Notably, Mastodon ''eschews'' file transfer - audio specifically - for fear of enabling piracy (issue #7495). Tumblr would have a more comprehensive version of file transfer.&lt;br /&gt;
[[Special:Contributions/172.71.146.136|172.71.146.136]] 03:17, 17 November 2022 (UTC)&lt;br /&gt;
&lt;br /&gt;
IRC has (X)DCC for File Transfers and for it's centralisation it depends on the deployment, the original network that became EFNet (Eris-Free Network) doesn't have a central server, but things like Libera and OFTC have centralised services for authentication and servers maintained by only one organisation. Btw for games on the fediverse (which Mastodon is part of) Misskey includes some, sadly they're centralised. [[User:Lanodan|Lanodan]] ([[User talk:Lanodan|talk]]) 03:40, 17 November 2022 (UTC)&lt;br /&gt;
&lt;br /&gt;
Tumblr does have group chats. They're publicly viewable by anyone, but only people in the group can send messages, so I think they still count as group chats.&lt;br /&gt;
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It appears we are all having a [[386]] moment watching Randall finally be wrong about something. How dare he?! [[Special:Contributions/172.70.111.30|172.70.111.30]] 05:37, 17 November 2022 (UTC)&lt;br /&gt;
: Nobody wants to put this train wreck into the explanation, but someone has to. I'm guessing we're waiting for further corrections just in case.&lt;br /&gt;
[[Special:Contributions/172.69.34.31|ki172.69.34.31]] 06:57, 17 November 2022 (UTC)&lt;br /&gt;
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Discord did add games recently: https://discord.com/blog/server-activities-games-voice-watch-together&lt;br /&gt;
[[User:Spenc|Spenc]] ([[User talk:Spenc|talk]]) 07:28, 17 November 2022 (UTC)&lt;br /&gt;
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He also just left out Matrix entirely, y'know I'm starting to think this isn't a serious comparison. --[[Special:Contributions/172.70.250.193|172.70.250.193]] 07:42, 17 November 2022 (UTC)&lt;br /&gt;
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Not sure what built-in would mean, but Slack has plenty of games you can install on it as an admin (Similar to Discord) [[Special:Contributions/172.70.162.223|172.70.162.223]] 09:52, 17 November 2022 (UTC)&lt;br /&gt;
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Also on April fool's days Tumblr occasionally have some sort of built-in game [[Special:Contributions/172.70.162.46|172.70.162.46]] 09:54, 17 November 2022 (UTC)&lt;br /&gt;
:xkcd has those too :p --[[Special:Contributions/172.71.215.3|172.71.215.3]] 12:55, 17 November 2022 (UTC)&lt;br /&gt;
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I'm wondering if we shouldn't include in the explanation, besides (on instead of) the link to {{Wikipedia|Mesh networking}}, also a link to {{Wikipedia|Comparison of software and protocols for distributed social networking}}. --[[User:Waldir|Waldir]] ([[User talk:Waldir|talk]]) 10:34, 17 November 2022 (UTC)&lt;br /&gt;
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I can't help to notice phpBB is so dead it's not even on this chart. -- Shirluban [[Special:Contributions/172.71.122.79|172.71.122.79]] 10:37, 17 November 2022 (UTC)&lt;br /&gt;
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I agree that the table is riddled with a surprising number of errors, but if the conspiracy theory that Randall has been replaced by another, evil cartoonist (as I write, the head of this explanation) is meant to be funny ... it didn't seem amusing to this particular explainer. [[User:Nitpicking|Nitpicking]] ([[User talk:Nitpicking|talk]]) 12:55, 17 November 2022 (UTC)&lt;br /&gt;
: It wasn't meant to be funny, it was meant to explain the comic. How much fake news about fake news about fake news do we need before we talk about it? It's clear to anybody who can tell how severe the mistakes are, that this is what the comic is about. [[Special:Contributions/172.70.111.29|172.70.111.29]] 15:10, 17 November 2022 (UTC)&lt;br /&gt;
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While I'm sure this could start a holy war in its own right, if you include MMS under the umbrella of SMS, you get sort-of file transfers and also group chats. [[User:Jpatterson|Jpatterson]] ([[User talk:Jpatterson|talk]]) 14:12, 17 November 2022 (UTC)&lt;br /&gt;
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If you think about the difference between user *run* instances vs user *hosted* instances, that might explain why Discord, Reddit, and Slack all have that check. However, I can't think of a possible reason why Mastodon is missing &amp;quot;Doesn't require central server&amp;quot; when that is its main selling point. :shrug: [[Special:Contributions/108.162.246.67|108.162.246.67]] 14:59, 17 November 2022 (UTC)&lt;br /&gt;
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Somebody reverted my change that IRC does not require a central server, but it doesn't. The protocol has clients connecting to _one_ server among a _network_ of interconnected servers, where anybody can run such a network. [[Special:Contributions/172.70.111.29|172.70.111.29]] 15:10, 17 November 2022 (UTC)&lt;br /&gt;
: There's still going to be centralization of administration even among federated nets of IRC servers, unlike USENET for example. [[Special:Contributions/172.69.33.168|172.69.33.168]] 15:31, 17 November 2022 (UTC)&lt;br /&gt;
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Are we encountering a new kind of vandalism where plausible edits are made introducing terrible prose, typos, and falsehoods? I noticed something similar happened with the recent Y2K comic. I really don't like to log in because we usually show we can do good work with most people logged out and IP's CDN-obfusticated for actual mass anonymity, but I will absolutely log in and push for page protection if vandals start trying to get insidious with subterfuge. [[Special:Contributions/172.69.33.168|172.69.33.168]] 15:31, 17 November 2022 (UTC)&lt;br /&gt;
:I don't know what vandalisms you're referring to. I've been adding the &amp;quot;Intermediate Edits&amp;quot;, mostly behind HTML comments while fine-tuning so as not to make it look awful during the time I know it'll be half-completed (or less!).&lt;br /&gt;
:As to terrible prose, I cannot refute the possibility that I'm guilty of that. I do my best, but genuine typos or personal proclivities for purple prose may indeed creep in.&lt;br /&gt;
:With falsehoods, nothing I have added (or changed) is deliberately wrong, but may be not the same interpretation as someone else. I'm somewhat handicapped by not being a (regular/registered) user of most of the services (and may understand, e.g., Mesh Networking only in a form that a modern re-envisaging of it has moved drastically away from), but I've been taking my cues from only the very best external references (or Wikipedia!) and trying to boil down the supernumary technicalities to a more Explainxkcd-friendly format.&lt;br /&gt;
:As always, another editor with a genuinely better idea (in all those aspects) can refine things. As, I notice, has already been started. Didn't get an Edit Conflict, which I put down to being short and sharp in my insertions, and hope I caused not too many for others. - Taking a break from imposing my own edits, now. I shall deal with any further changes (or reversions) in good heart when I get the time again, later. Good luck and good editing to those who wish to pick up any of the work (or rework it) in the meantime. [[Special:Contributions/172.70.91.53|172.70.91.53]] 15:58, 17 November 2022 (UTC)&lt;br /&gt;
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I think some of you missed the forest for the trees. The point of the comic is to illustrate how feature comparison charts, which are very common sales tools, might be abused to show that the seller's product looks better than it really is. That should be in the explanation of the comic. [[Special:Contributions/172.70.210.243|172.70.210.243]] 17:27, 17 November 2022 (UTC)&lt;br /&gt;
: Agreed, there are a lot of the points that could be debated. Is &amp;quot;central server&amp;quot; meant a server not controlled by you? What is a user-run instance? As twitter has several clients available but is listed without &amp;quot;User-run instances&amp;quot;. I bet cybiko is trending on google search right now. [[User:Harald|Harald]] ([[User talk:Harald|talk]]) 17:33, 17 November 2022 (UTC)&lt;br /&gt;
::Sort of https://trends.google.com/trends/explore?date=now%207-d&amp;amp;q=cybiko [[Special:Contributions/172.71.154.38|172.71.154.38]] 19:13, 17 November 2022 (UTC)&lt;br /&gt;
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===Proposal===&lt;br /&gt;
Instead of trying to describe all the common platforms and features, as the HTML comments editor plans, why not just link to their Wikipedia articles and discuss the edge cases, like what counts as group chat or file transfer? Most people will understand the general terms. [[Special:Contributions/172.70.214.252|172.70.214.252]] 19:41, 17 November 2022 (UTC)&lt;/div&gt;</summary>
		<author><name>172.70.214.252</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=2697:_Y2K_and_2038&amp;diff=298560</id>
		<title>2697: Y2K and 2038</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=2697:_Y2K_and_2038&amp;diff=298560"/>
				<updated>2022-11-11T18:57:37Z</updated>
		
		<summary type="html">&lt;p&gt;172.70.214.252: /* Explanation */ more&lt;/p&gt;
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&lt;div&gt;{{comic&lt;br /&gt;
| number    = 2697&lt;br /&gt;
| date      = November 11, 2022&lt;br /&gt;
| title     = Y2K and 2038&lt;br /&gt;
| image     = y2k_and_2038_2x.png&lt;br /&gt;
| imagesize = 527x190px&lt;br /&gt;
| noexpand  = true&lt;br /&gt;
| titletext = It's taken me 20 years, but I've finally finished rebuilding all my software to use 33-bit signed ints.&lt;br /&gt;
}}&lt;br /&gt;
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==Explanation==&lt;br /&gt;
{{incomplete|Created by a Y2K-BRICKED BOT. Do NOT delete this tag too soon.}}&lt;br /&gt;
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The Y2K bug, or more formally, the {{w|year 2000 problem}}, was the computer errors caused by two digit software representations of calendar years not correctly handling the year 2000, such as by treating it the same as 1900 or 19100. The {{w|year 2038 problem}} is a similar issue with timestamps in {{w|Unix time}} format, which will overflow their signed 32-bit binary representation in 2038.&lt;br /&gt;
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While initial estimates were that the Y2K problem would require about half a trillion dollars to address, there was widespread recognition of its potential severity several years in advance. Concerted efforts among organizations including computer and software manufacturers and their corporate and government users reflected unprecedented cooperation, testing, and enhancement of affected systems costing substantially less than the initial estimates. On new years day in 2000, few major errors actually occurred. Those that did usually did not disrupt essential processes or cause serious problems, and the few that did were usually addressed in days to weeks. The software code reviews involved allowed correcting other errors and providing various enhancements which likely made up for the the cost of merely correcting the date bug.{{actual citation needed}}&lt;br /&gt;
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It is unclear whether the 2038 problem will be addressed as effectively in time, but documented experience with the Y2K bug and increased software modularity has allowed many otherwise vulnerable systems to already upgrade to wider timestamp and date formats, so there is reason to believe that it may be even less consequential and expensive.&lt;br /&gt;
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The title text refers to replacing the 32-bit signed Unix time format with a new, 33-bit time and date format, which is very unlikely as almost all computer data structure formats are allocated no more finely than in 8-bit bytes. Taking 20 years to develop and implement such a format is not entirely counterproductive, as it would add another 48 years of capability.&lt;br /&gt;
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==Transcript==&lt;br /&gt;
{{incomplete transcript|Do NOT delete this tag too soon.}}&lt;br /&gt;
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A timeline rectangle spanning from 2000 to 2038 divided into two halves. The first is labeled RECOVERING FROM THE Y2K BUG and the second PREPARING FOR THE 2038 BUG. An arrow labeled NOW is pointing approximately at the year 2022.&lt;br /&gt;
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Caption:&lt;br /&gt;
REMINDER: BY NOW YOU SHOULD HAVE FINISHED YOUR Y2K RECOVERY AND BE SEVERAL YEARS INTO 2038 PREPARATION&lt;br /&gt;
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{{comic discussion}}&lt;/div&gt;</summary>
		<author><name>172.70.214.252</name></author>	</entry>

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