txt.sour.is @<xkcd-com https://feeds.twtxt.net/xkcd-com/twtxt.txt> "**Periodic Table Regions** Cesium-133, let it be. Cesium-134, let it be even more. ⌘ Read more"

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Thu, Mar 28 18:00 (7w ago)

Periodic Table Regions

Cesium-133, let it be. Cesium-134, let it be even more.

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