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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.
Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).
Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.