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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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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.
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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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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.