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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.
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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 more bacteria in your mouth than there are people in the world.
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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).