36. Krypton: It’s A Metric

Like argon, today’s noble gas coincidentally features prominently in science fiction — albeit in name only. But krypton also takes a place in the science factual story of international weights and measures.

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33. Arsenic: It’s Not Easy Being Green

Considering how synonymous this episode’s element is with “poison,” it’s astounding how eager people have historically been to ingest the stuff.

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