In this undated photo provided by the Ecole Polytechnique Federale de Lausanne, a previously paralyzed rat in a special harness walks voluntarily after several weeks of rehabilitation in a laboratory ... more 
In this undated photo provided by the Ecole Polytechnique Federale de Lausanne, a previously paralyzed rat in a special harness walks voluntarily after several weeks of rehabilitation in a laboratory in Switzerland. In the new experiment reported in the Friday, June 1, 2012 issue of the journal Science, researchers led by Gregoire Courtine, of the University of Zurich and the technical university EPFL in Lausanne, Switzerland, stimulated spinal nerve circuits and used physical training. The stimulation was electrical current from implanted electrodes plus injections of a chemical mix, helping the rodents overcome paralysis to walk and climb stairs. (AP Photo/Ecole Polytechnique Federale de Lausanne) less 
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Associated Press | Photo By Ecole Polytechnique Federale de Lausanne
Thu, May 31, 2012 3:00 PM EDT