In this undated photo provided by the University of Louisville, Kent Stephenson, the second person to undergo epidural stimulation of the spinal cord, voluntarily raises his leg while stimulated at the Human Locomotion Research Center laboratory, a part of the University of Louisville’s Kentucky Spinal Cord Injury Research Center, Frazier Rehab Institute, in Louisville Ky. Three years ago, doctors reported that zapping a paralyzed man’s spinal cord with electricity allowed him to stand and move his legs. Now they’ve done the same with three more patients, suggesting their original success was no fluke. (AP Photo/University of Louisville)
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