Hugh Herr enjoys nothing more than scaling a cliff - even though both his legs were amputated after a disastrous climbing expedition when he was a teenager. As if conquering a 200ft rock face wasn't hard enough, one of his prosthetic legs fell off during his latest climb - but he calmly waited for it to be roped back up to him before making it to the top. Mr Herr runs a lab making bionic legs at Massachusetts Institute of Technology, and insists artificial limbs are an advantage. <3
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