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Did you know?
There are approximately 3 million unintended pregnancies in the United States each year.
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There are 20 feet of blood vessels in each square inch of human skin.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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The longest a person has survived after a heart transplant is 24 years.
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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).