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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.