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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.