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Did you know?
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 over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Your heart beats over 36 million times a year.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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The top five reasons that children stay home from school are as follows: colds, stomach flu (gastroenteritis), ear infection (otitis media), pink eye (conjunctivitis), and sore throat.