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Did you know?
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.
Did you know?
The longest a person has survived after a heart transplant is 24 years.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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There are 60,000 miles of blood vessels in every adult human.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.