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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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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.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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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.