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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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There are more bacteria in your mouth than there are people in the world.

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Women are 50% to 75% more likely than men to experience an adverse drug reaction.

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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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There are more sensory neurons in the tongue than in any other part of the body.

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