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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.
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
Everyone has one nostril that is larger than the other.
After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
There are more sensory neurons in the tongue than in any other part of the body.