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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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Your heart beats over 36 million times a year.
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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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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).