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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.
There are more sensory neurons in the tongue than in any other part of the body.
There are 20 feet of blood vessels in each square inch of human skin.
There are approximately 3 million unintended pregnancies in the United States each year.
The FDA recognizes 118 routes of administration.
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