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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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The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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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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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.