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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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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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There are 60,000 miles of blood vessels in every adult human.