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There are 20 feet of blood vessels in each square inch of human skin.
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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
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There are approximately 3 million unintended pregnancies in the United States each year.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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.