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Vitamin D3 (cholecalciferol)
Berlin, winter of 1919. A pediatrician wheels a mercury-vapor lamp beside a child with bowed legs; weeks later, the bones harden and straighten....

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You load up on calcium for strong bones—then your heart scan shows calcium where it doesn't belong. What if a quiet vitamin acts like a traffic cop, waving...

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In 1808, a young Humphry Davy hooked his new battery to a paste of "lime," boiled off the mercury, and—against all expectations—pulled a silvery metal from...

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