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Everyone has one nostril that is larger than the other.

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An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.

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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.

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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

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