Neil Gaiman is many things: A writer, a screenwriter, a storyteller. But before all that, he is first and foremost and defender of imagination. And imagination, he says, is under threat. "The imagination -- it's a muscle," he told CNN's Christiane Amanpour on Wednesday. "It's a really important thing. If you want to build the future, if you want to create a literate generation, if you want to create a generation that is not criminal." Gaiman says that libraries -- those endangered stockpiles