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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.

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The most dangerous mercury compound, dimethyl mercury, is so toxic that even a few microliters spilled on the skin can cause death. Mercury has been shown to accumulate in higher amounts in the following types of fish than other types: swordfish, shark, mackerel, tilefish, crab, and tuna.

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If all the neurons in the human body were lined up, they would stretch more than 600 miles.

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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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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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