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Did you know?
There are 60,000 miles of blood vessels in every adult human.
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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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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Fewer than 10% of babies are born on their exact due dates, 50% are born within 1 week of the due date, and 90% are born within 2 weeks of the date.
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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.