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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.

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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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It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.

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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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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