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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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Persons who overdose with cardiac glycosides have a better chance of overall survival if they can survive the first 24 hours after the overdose.
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There are more sensory neurons in the tongue than in any other part of the body.
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There are more bacteria in your mouth than there are people in the world.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.