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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.
Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.
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.