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Did you know?
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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People about to have surgery must tell their health care providers about all supplements they take.
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More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.
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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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