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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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.