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There are more bacteria in your mouth than there are people in the world.

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Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.

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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.

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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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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

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