20. Calcium: Stone and Bone

Stories of turning flesh to stone — and vice versa — are common in mythology. With calcium, we see how those same transitions can happen in the real world.

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16. Sulfur: No Mistakes, Only Happy Accidents

From Vulcan to vultures, today’s element brings stories of unintended consequences.

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9. Fluorine: Tyger Tyger, Burning Bright

Just try to tally the body count behind the periodic table’s most reactive element, and learn why it’s good for your health.

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7. Nitrogen: Taking The Good With The Bad

Today we meet one man who’s responsible for the death of millions — and the survival of billions.

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