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the bones in the thigh, I'm not sure if they are tougherthan concrete but they are as tough as concrete. (:

I guess it depends on what concrete you use (and if you mix it with agregate in the right proportions), the bones are probably as tough as some concretes.

Tooth enamel is the hardest part of the body and probably the contender for the toughest.

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13y ago

What else can I help you with?