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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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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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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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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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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.