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The human body produces and destroys 15 million blood cells every second.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.
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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.