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According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.
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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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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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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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There are 20 feet of blood vessels in each square inch of human skin.