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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19. Potassium: An Undeserved Reputation

There’s no avoiding discussing the banana in this episode, even though it really doesn’t deserve its strong association with Element 19.

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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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