The human body produces and destroys 15 million blood cells every second.
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Your heart beats over 36 million times a year.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.