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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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Your heart beats over 36 million times a year.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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The horizontal fraction bar was introduced by the Arabs.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.