INDIANAPOLIS (AP) - Dogs with paralyzed hind legs regained the ability to walk after getting a shot of a chemical cousin of antifreeze that helped repair nerve cells in their damaged spinal cords, scientists reported. Purdue University researchers who led the project hope the approach can soon be tried in people, but caution that there are significant differences between human and canine spinal cords. The treatment only worked on dogs given the injections within about three days of their injury. Some dogs not given the injections eventually walked again, but those getting the new treatment had a dramatically higher recovery...