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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.
In 2010, opiate painkllers, such as morphine, OxyContin®, and Vicodin®, were tied to almost 60% of drug overdose deaths.
There are 20 feet of blood vessels in each square inch of human skin.
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
The average adult has about 21 square feet of skin.
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