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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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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.
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There are 20 feet of blood vessels in each square inch of human skin.
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There are more sensory neurons in the tongue than in any other part of the body.
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There are more bacteria in your mouth than there are people in the world.