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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.
Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
About 60% of newborn infants in the United States are jaundiced; that is, they look yellow. Kernicterus is a form of brain damage caused by excessive jaundice. When babies begin to be affected by excessive jaundice and begin to have brain damage, they become excessively lethargic.