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There are 20 feet of blood vessels in each square inch of human skin.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
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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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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.