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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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There are more bacteria in your mouth than there are people in the world.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.
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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.