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There are more bacteria in your mouth than there are people in the world.
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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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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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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).
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The human body produces and destroys 15 million blood cells every second.