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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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There are more nerve cells in one human brain than there are stars in the Milky Way.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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Medication errors are three times higher among children and infants than with adults.