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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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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.