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If all the neurons in the human body were lined up, they would stretch more than 600 miles.

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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.

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

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Illicit drug use costs the United States approximately $181 billion every year.

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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.

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