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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.

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Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.

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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.

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The familiar sounds of your heart are made by the heart's valves as they open and close.

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