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Did you know?
The average adult has about 21 square feet of skin.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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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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Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.
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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.
![(A) Each bronchiole terminates in an alveolar sac, a group of alveoli; (B) alveoli encased by networ](https://biology-forums.com/gallery/47/medium_14755_10_09_12_7_13_31_84891921.jpeg)
![This engraving of the Boston Massacre (1770) became the most reprinted depiction of the event, and p](https://biology-forums.com/gallery/47/medium_374628_15_08_15_11_50_51_22235741.jpeg)
![American soldiers—some of them regulars in deep blue uniforms, others in buckskin cowboy outfits— fi](https://biology-forums.com/gallery/47/medium_375552_19_08_15_9_09_50_223155.jpeg)