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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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There are approximately 3 million unintended pregnancies in the United States each year.
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For pediatric patients, intravenous fluids are the most commonly cited products involved in medication errors that are reported to the USP.