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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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There are more bacteria in your mouth than there are people in the world.
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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.
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Approximately 25% of all reported medication errors result from some kind of name confusion.
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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.