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Did you know?
The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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The human body produces and destroys 15 million blood cells every second.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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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.