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There are 20 feet of blood vessels in each square inch of human skin.
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There are approximately 3 million unintended pregnancies in the United States each year.
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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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Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.
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The familiar sounds of your heart are made by the heart's valves as they open and close.