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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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Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.
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Everyone has one nostril that is larger than the other.
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There are more bacteria in your mouth than there are people in the world.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.