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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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There are approximately 3 million unintended pregnancies in the United States each year.
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Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.
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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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In 1864, the first barbiturate (barbituric acid) was synthesized.