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The human body produces and destroys 15 million blood cells every second.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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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.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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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.