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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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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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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.