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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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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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The average office desk has 400 times more bacteria on it than a toilet.
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More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.