https://www.explainxkcd.com/wiki/api.php?action=feedcontributions&feedformat=atom&user=ShadwellNHexplain xkcd - User contributions [en]2026-04-22T04:52:36ZUser contributionsMediaWiki 1.30.0https://www.explainxkcd.com/wiki/index.php?title=Talk:2321:_Low-Background_Metal&diff=193543Talk:2321: Low-Background Metal2020-06-17T20:02:06Z<p>ShadwellNH: Corrected topic</p>
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I can't help but notice that the basic premise of this comic is very much like the reason for going back to 1970 in ''Avengers: Endgame'', when they needed more Pym particles for time travel. I wonder if Randall re-watched it again recently? — [[User:KarMann|KarMann]] ([[User talk:KarMann|talk]]) 17:10, 17 June 2020 (UTC)<br />
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== Drawing ==<br />
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There's one leg of the time-machine missing from the 3rd panel. (or is it the side of a base?) --[[Special:Contributions/162.158.155.126|162.158.155.126]] 19:57, 17 June 2020 (UTC)<br />
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== Mined lead ==<br />
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Pb-210 (half-life 20.4 years) is a decay product of radon, and thus accumulates everywhere that is exposed to the atmosphere or where radon seeps from the ground. I suspect it could be a contaminant in lead from some lead mines, but wasn't able to find any references [[User:ShadwellNH|ShadwellNH]] ([[User talk:ShadwellNH|talk]]) 20:00, 17 June 2020 (UTC) Paul</div>ShadwellNHhttps://www.explainxkcd.com/wiki/index.php?title=Talk:2321:_Low-Background_Metal&diff=193542Talk:2321: Low-Background Metal2020-06-17T20:00:42Z<p>ShadwellNH: Is mined lead contaminated with Pb-210?</p>
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<div><!--Please sign your posts with ~~~~ and don't delete this text. New comments should be added at the bottom.--><br />
I can't help but notice that the basic premise of this comic is very much like the reason for going back to 1970 in ''Avengers: Endgame'', when they needed more Pym particles for time travel. I wonder if Randall re-watched it again recently? — [[User:KarMann|KarMann]] ([[User talk:KarMann|talk]]) 17:10, 17 June 2020 (UTC)<br />
<br />
== Drawing ==<br />
<br />
There's one leg of the time-machine missing from the 3rd panel. (or is it the side of a base?) --[[Special:Contributions/162.158.155.126|162.158.155.126]] 19:57, 17 June 2020 (UTC)<br />
<br />
<br />
== Drawing ==<br />
<br />
Pb-210 (half-life 20.4 years) is a decay product of radon, and thus accumulates everywhere that is exposed to the atmosphere or where radon seeps from the ground. I suspect it could be a contaminant in lead from some lead mines, but wasn't able to find any references [[User:ShadwellNH|ShadwellNH]] ([[User talk:ShadwellNH|talk]]) 20:00, 17 June 2020 (UTC) Paul</div>ShadwellNH