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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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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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The average office desk has 400 times more bacteria on it than a toilet.