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What it’s like to be young, brilliant, fawned over by multimillionaire investors, courted by universities and corporations around the world, and forever racing—sometimes as teammates, sometimes as rivals—to change medicine as we know it.

Hugh Herr was a teenage mountain-climbing phenom when a blizzard took his legs. Now the MIT professor has used science to get them back, building artificial limbs so advanced, they force us to rethink what “able-bodied” means.