There are 60,000 miles of blood vessels in every adult human.
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Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.
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The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.
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There are more bacteria in your mouth than there are people in the world.
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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.