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The longest a person has survived after a heart transplant is 24 years.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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More than 4.4billion prescriptions were dispensed within the United States in 2016.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.