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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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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Cyanide works by making the human body unable to use oxygen.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.