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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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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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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.