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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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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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Vaccines prevent between 2.5 and 4 million deaths every year.
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Everyone has one nostril that is larger than the other.
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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.