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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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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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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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The training of an anesthesiologist typically requires four years of college, 4 years of medical school, 1 year of internship, and 3 years of residency.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.