Double amputee Hugh Herr, who leads the biomechatronics research group at MIT Media Lab, describes the evolution of prostheses through this photo essay. He concludes with the Modular Prosthetic Limb, developed by the Johns Hopkins University Applied Physics Lab, which can be controlled by thought. "Right now the payers think that high tech is expensive and should be avoided. I’m trying to change that paradigm," he said.

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