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		<updated>2026-04-16T00:27:27Z</updated>
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	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=Talk:2639:_Periodic_Table_Changes&amp;diff=287890</id>
		<title>Talk:2639: Periodic Table Changes</title>
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				<updated>2022-06-30T07:18:47Z</updated>
		
		<summary type="html">&lt;p&gt;162.158.38.27: &lt;/p&gt;
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The format of this comic appears most similar to https://xkcd.com/1902/.  Is it worth noting that, in some representations of the periodic table (see https://ptable.com/#Electrons), Helium is indeed placed in the second column next to Hydrogen? [[User:Dextrous Fred|Dextrous Fred]] ([[User talk:Dextrous Fred|talk]]) 21:54, 29 June 2022 (UTC)&lt;br /&gt;
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Nice. I'm doing the old &amp;quot;what elements have been obscured/overwritten&amp;quot; thing, after far too long since actually memorising the Periodic Table that was on my school's lab wall... But, hey! Where has Hahnium got to? [[Special:Contributions/172.70.162.77|172.70.162.77]] 22:25, 29 June 2022 (UTC)&lt;br /&gt;
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I wonder why he kept the Latinate abbreviations for Antimony and Mercury. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 23:17, 29 June 2022 (UTC)&lt;br /&gt;
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The changes by Asdf seem like they mostly belong in the Transcript, not Explanation.&lt;br /&gt;
:I moved some of my lengthy descriptions from Explanation to Transcript, hopefully this helps. Sorry if I caused inconvenience. -[[User:Asdf|Asdf]] ([[User talk:Asdf|talk]]) 00:00, 30 June 2022 (UTC)&lt;br /&gt;
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Laaaaame! Not revolutionary enough! Why not simply get rid of all these historical accidents and indicate any element by its nuclear charge? [[Special:Contributions/172.71.102.117|172.71.102.117]] 07:05, 30 June 2022 (UTC)&lt;br /&gt;
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Anyone else find it ironic that the new kinds of carbon are indexed with Roman numerals on the same comic where it says &amp;quot;this isn't Ancient Rome&amp;quot;? [[Special:Contributions/162.158.38.27|162.158.38.27]] 07:18, 30 June 2022 (UTC)&lt;/div&gt;</summary>
		<author><name>162.158.38.27</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=Talk:2636:_What_If%3F_2_Countdown&amp;diff=287489</id>
		<title>Talk:2636: What If? 2 Countdown</title>
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				<updated>2022-06-23T20:51:47Z</updated>
		
		<summary type="html">&lt;p&gt;162.158.38.27: &lt;/p&gt;
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I've started the table to explain all the calendar entries. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 00:19, 23 June 2022 (UTC)&lt;br /&gt;
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Is the dog minutes calculation backwards? 777,777 dog minutes should be 777,777 x 7 human minutes, which is over 10 years. Randall seems to be dividing instead of multiplying. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 00:36, 23 June 2022 (UTC)&lt;br /&gt;
: No - 1 human year = 7 dog years; 1 dog year = 1/7 human year; 1 dog minute = 1/7 human minute; 777,777 dog minutes = 111,111 human minutes = 77 days, 3 hours, 51 minutes. [[Special:Contributions/172.70.90.173|172.70.90.173]] 11:32, 23 June 2022 (UTC)&lt;br /&gt;
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First entry is probably mistake by Randall, e^pi would give value of 84.5 [[Special:Contributions/162.158.203.38|162.158.203.38]] 11:57, 23 June 2022 (UTC)&lt;br /&gt;
: That would be too high, though. 82.xxx days (from midnight at the start of launch day) would fall within the 83rd day before it (Jun 22). 84.5 would fall within the 85th (Jun 20). [[Special:Contributions/172.70.91.58|172.70.91.58]] 12:15, 23 June 2022 (UTC)&lt;br /&gt;
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Not sure if this is even worth mentioning, but he forgot the box around the date number in the top corner for August 29th. [[Special:Contributions/172.70.126.151|172.70.126.151]] 12:49, 23 June 2022 (UTC)&lt;br /&gt;
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Fyi, used wolfram alpha for most of the calculations. Seems to be able to handle anything I throw at it (nanocenturies, megaseconds, fortnights etc) [[User:Aditya95sriram|Aditya95sriram]] ([[User talk:Aditya95sriram|talk]]) 13:02, 23 June 2022 (UTC)aditya95sriram&lt;br /&gt;
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Some of the calculations done forward (assuming what Randall means as a Generation, for example) might be best done as &amp;quot;to get this many days, what does Randall think ilhe is starting from. And see if 365, 365.25 or even 365.24 days per year works best, where relevent. Although I think in many cases you'll find the fractional differences negligable, when done right. (I'm also a bit surprised by the off-by-one errors in days-to-go and derived value, but I suspect that this is because of [[2585: Rounding|assymetric rounding effects]] that would be revealed by running the assumption backwards and seeing how different (or otherwise) the decimals actually are.) [[Special:Contributions/172.70.85.211|172.70.85.211]] 13:32, 23 June 2022 (UTC)&lt;br /&gt;
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Not sure about most numbers but at least the order of magnitude seemed plausible. I can't quite find a proper way to read August 28th.  	π^π^π is roughly 80662.666 - if you read πcoseconds as &amp;quot;picoseconds&amp;quot;, that's way less than a second. I have no idea what π * coseconds are supposed to be. π * c * o * seconds doesn't look much better - there are values associated with &amp;quot;c&amp;quot; (speed of light, for example) but I have no idea what &amp;quot;o&amp;quot; could be and certainly nothing that would make this a unit of time. Sixteen days would be 1,353,600,000,000,000,000 ps (picoseconds). π^π^π^π is three orders of magnitude too small, π^π^π^π^π is many orders of magnitude too big a number. Am I missing something (really obvious, maybe?) here? [[User:627235|627235]] ([[User talk:627235|talk]]) 14:52, 23 June 2022 (UTC)&lt;br /&gt;
: Exponent towers are by convention evaluated top-down, so pi^pi^pi should be read as pi^(pi^pi), which is ~1.34e18, which in picoseconds is ~15.51 days. [[Special:Contributions/172.70.114.71|172.70.114.71]] 15:21, 23 June 2022 (UTC)&lt;br /&gt;
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10,000 minutes in Heaven is making out for a week. I was able to find a record for the longest kiss (58 hours, 35 minutes), but not the longest make-out session. I think Randall may be indulging in some nerdy wishfull thinking. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 15:27, 23 June 2022 (UTC)&lt;br /&gt;
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When the beer song reached F(0) how would you 'take one down' from -1 bottles of beer? Would they be imaginary bottles of beer? (Joking) At F(n-1) would there be a matter/antimatter annihilation, where Randal could do a riff of What-If #1 and describe the play by play of the bartender turning into exotic forms of matter? [[Special:Contributions/172.69.68.88|172.69.68.88]] 15:58, 23 June 2022 (UTC)&lt;br /&gt;
:(Not ✓-1, it's just straight repeated subtraction, not a power function...) After so much beer, you probably think it a good idea (even necessary) to fill cans up and start to put them back up on the wall... Not sure you could sustain it, to the point of F(-99), but I think someone'd be more than ready to start the process when F(-1) is invoked, for any group of just a few likely individuals.. [[Special:Contributions/172.70.91.58|172.70.91.58]] 16:23, 23 June 2022 (UTC)&lt;br /&gt;
:This begs the question of what beer bottles are doing on a wall, rather than a shelf. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 16:26, 23 June 2022 (UTC)&lt;br /&gt;
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We've finally filled in all the units columns in the table. Hopefully someone can automate turning that into a transacript. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 16:51, 23 June 2022 (UTC)&lt;br /&gt;
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Funfact: This comic mentions Cyndi Lauper by name, and it was published on her birthday… [[Special:Contributions/162.158.38.27|162.158.38.27]] 20:51, 23 June 2022 (UTC)&lt;/div&gt;</summary>
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