“He presents a video clip of a rat with a severed spinal cord dragging around its paralyzed hind legs. Having dragged my mostly unresponsive left leg around for two years, I think I know something about the rodent’s life. In the next clip, however, that rat, just 90 days later, is walking on all fours. A team at the MIT center led by Herr’s colleague Robert Langer successfully regrew the rat’s spinal cord by implanting a dissolvable scaffold seeded with neural stem cells. In Herr’s world, the limbless can be whole again, the paralyzed can walk. Making the extraordinary seem ordinary is maybe the whole point.” Outside’s Todd Balf on The $100 Million Plan to End Paralysis.