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Did you know?
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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Your heart beats over 36 million times a year.
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Medication errors are more common among seriously ill patients than with those with minor conditions.
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The longest a person has survived after a heart transplant is 24 years.
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There are 60,000 miles of blood vessels in every adult human.