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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Medication errors are three times higher among children and infants than with adults.
All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.
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.