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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 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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There are 60,000 miles of blood vessels in every adult human.
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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.