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The average office desk has 400 times more bacteria on it than a toilet.
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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
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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.
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.