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Your heart beats over 36 million times a year.
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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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Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.
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The horizontal fraction bar was introduced by the Arabs.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.