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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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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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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.