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Did you know?
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Medication errors are more common among seriously ill patients than with those with minor conditions.
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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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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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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.