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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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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.
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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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Vaccines prevent between 2.5 and 4 million deaths every year.