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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).

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Coca-Cola originally used coca leaves and caffeine from the African kola nut. It was advertised as a therapeutic agent and "pickerupper." Eventually, its formulation was changed, and the coca leaves were removed because of the effects of regulation on cocaine-related products.

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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

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In 1864, the first barbiturate (barbituric acid) was synthesized.

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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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