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The human body produces and destroys 15 million blood cells every second.
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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.
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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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The familiar sounds of your heart are made by the heart's valves as they open and close.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.