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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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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.