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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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People about to have surgery must tell their health care providers about all supplements they take.
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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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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.