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There are 20 feet of blood vessels in each square inch of human skin.
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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.
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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.