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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.