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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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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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The average office desk has 400 times more bacteria on it than a toilet.
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More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.
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Vaccines prevent between 2.5 and 4 million deaths every year.