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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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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.

