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There are 20 feet of blood vessels in each square inch of human skin.
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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
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Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.
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The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.
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Asthma cases in Americans are about 75% higher today than they were in 1980.