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There are 20 feet of blood vessels in each square inch of human skin.
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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 familiar sounds of your heart are made by the heart's valves as they open and close.
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Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.