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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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Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.
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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 horizontal fraction bar was introduced by the Arabs.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.