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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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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
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Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.
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The horizontal fraction bar was introduced by the Arabs.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.