27. Cobalt: Mischief Managed

Cobalt is a tricksy little element, which means the scientists who’ve dealt with it the most are some of the cleverest people to have ever walked the Earth.

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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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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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