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There are 20 feet of blood vessels in each square inch of human skin.
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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.
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The average office desk has 400 times more bacteria on it than a toilet.