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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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The FDA recognizes 118 routes of administration.