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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.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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More than 4.4billion prescriptions were dispensed within the United States in 2016.