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The average adult has about 21 square feet of skin.
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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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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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In 1864, the first barbiturate (barbituric acid) was synthesized.