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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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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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The horizontal fraction bar was introduced by the Arabs.
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People about to have surgery must tell their health care providers about all supplements they take.
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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.