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There are 20 feet of blood vessels in each square inch of human skin.
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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.