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Did you know?
Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
Did you know?
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.
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The human body produces and destroys 15 million blood cells every second.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.