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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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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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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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Vaccines prevent between 2.5 and 4 million deaths every year.
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There are more nerve cells in one human brain than there are stars in the Milky Way.