17. Chlorine: Too High Or Too Low, There Ain’t No In-Betweens

Chlorine is an element that causes some extreme reactions, and occasionally inspires some pretty extreme reactions in humans, too.

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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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