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There are 20 feet of blood vessels in each square inch of human skin.

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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.

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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.

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