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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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Cyanide works by making the human body unable to use oxygen.
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You should not take more than 1,000 mg of vitamin E per day. Doses above this amount increase the risk of bleeding problems that can lead to a stroke.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.