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The human body produces and destroys 15 million blood cells every second.
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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.
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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.
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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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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.