Adult zebrafish can take a blow to their spinal cords that would paralyze a human forever. But within six weeks you’d never know anything had happened to them. “They’re pros,” says new Packard grantee Catherina Becker. “Clearly, they can do something we cannot but want to be able to do.” Among other things, Becker is searching for small, potent agents that can turn on the neural stem cells that mend the fish.