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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.
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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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Blood is approximately twice as thick as water because of the cells and other components found in it.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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There are more bacteria in your mouth than there are people in the world.