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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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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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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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There are more bacteria in your mouth than there are people in the world.