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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.
On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
The average office desk has 400 times more bacteria on it than a toilet.
There are more nerve cells in one human brain than there are stars in the Milky Way.
Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.