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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).
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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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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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The average adult has about 21 square feet of skin.