15 Amazing Facts About the Human Body You Won't Believe

Your stomach lining is replaced every few days so its own acid doesn't digest it

Laid end to end, your blood vessels would wrap around Earth more than twice

Gram for gram, healthy bone outperforms steel and concrete in resisting load

Most of your body's atoms and cells are constantly being swapped out and rebuilt

Old textbook 'facts' (gut = tennis court, 10% of brain) are myths science has corrected

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