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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.