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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Warfarin was developed as a consequence of the study of a strange bleeding disorder that suddenly occurred in cattle on the northern prairies of the United States in the early 1900s.
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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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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.