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It is difficult to obtain enough calcium without consuming milk or other dairy foods.

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Opium has influenced much of the world's most popular literature. The following authors were all opium users, of varying degrees: Lewis Carroll, Charles, Dickens, Arthur Conan Doyle, and Oscar Wilde.

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

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If all the neurons in the human body were lined up, they would stretch more than 600 miles.

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Aspirin may benefit 11 different cancers, including those of the colon, pancreas, lungs, prostate, breasts, and leukemia.

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