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The average adult has about 21 square feet of skin.

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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.

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

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Cyanide works by making the human body unable to use oxygen.

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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.

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