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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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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
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There are 20 feet of blood vessels in each square inch of human skin.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.