Scientists with the international scientific collaboration known as the "Walk Again Project" use noninvasive brain-machine interfaces in their efforts to reawaken damaged fibers in the spinal cord. AASDAP and Lente Viva Filmes, São Paulo, Brazil/Nature hide caption

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AASDAP and Lente Viva Filmes, São Paulo, Brazil/Nature

Claire Lomas walks the last mile of the London Marathon on May 8, 2012 in London, England. After a riding accident left her paralyzed from the waist down in 2007, Lomas completed the race walking 2 miles a day over 16 days with the help of a ReWalk bionic suit (by Argo Medical Technologies). Peter Macdiarmid/Getty Images hide caption

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Peter Macdiarmid/Getty Images