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There are 60,000 miles of blood vessels in every adult human.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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More than 4.4billion prescriptions were dispensed within the United States in 2016.
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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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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.