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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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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.
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Cyanide works by making the human body unable to use oxygen.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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Women are 50% to 75% more likely than men to experience an adverse drug reaction.