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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Though “Krazy Glue” or “Super Glue” has the ability to seal small wounds, it is not recommended for this purpose since it contains many substances that should not enter the body through the skin, and may be harmful.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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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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In 1844, Charles Goodyear obtained the first patent for a rubber condom.