Twelve years ago Peng Shui-lin’s body was severed when he was hit by a truck – it took a team of 20 doctors to treat him, but he survived. Doctors grafted skin from his head to seal his torso, leaving him alive but without legs. Then, last year, scientists at the China Rehabilitation Research Center in Beijing learned about his struggles, and outfitted him with a specially-designed pair of bionic legs, along with a modified walker. Now Peng is learning to walk again.—Gregory Mone