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Fewer than 10% of babies are born on their exact due dates, 50% are born within 1 week of the due date, and 90% are born within 2 weeks of the date.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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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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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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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.