Only 1 in 25 People Pass This Human Body Quiz Without Googling – You In?

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First instinct: does your stomach actually replace its entire inner lining every 3 to 4 days just to avoid digesting itself?

First instinct: does your stomach actually replace its entire inner lining every 3 to 4 days just to avoid digesting itself?

The human body is an absolute wonderland of bizarre mechanics and surprising quirks. Did you know your stomach acid can dissolve steel, yet manages not to digest your own stomach? Or that you get a brand-new skeleton every ten years? From producing enough saliva to fill two swimming pools over your lifetime to the reality of non-stop growing ears, our bodies are beautifully weird. But how well do you actually know the biology keeping you upright? Test your instincts across these 40 fast-paced questions. Let's see if you can snag a perfect score—your own anatomy might surprise you!