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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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There are 20 feet of blood vessels in each square inch of human skin.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.