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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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Many people have small pouches in their colons that bulge outward through weak spots. Each pouch is called a diverticulum. About 10% of Americans older than age 40 years have diverticulosis, which, when the pouches become infected or inflamed, is called diverticulitis. The main cause of diverticular disease is a low-fiber diet.

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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

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By definition, when a medication is administered intravenously, its bioavailability is 100%.

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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

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Video: Protein digestion - stomach & small intestine

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