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There are 60,000 miles of blood vessels in every adult human.

Did you know?

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

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

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Human kidneys will clean about 1 million gallons of blood in an average lifetime.

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