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Did you know?
The average adult has about 21 square feet of skin.
Did you know?
Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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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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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.