SNL veterans Andy Samberg, Jorma Taccone and Akiva Schaffer describe themselves as "frappers" — fake rappers. Working together as The Lonely Island, their new film 'Popstar' satirizes pop documentaries. Ken Tucker reviews Paul Simon's new album, 'Stranger to Stranger.' Science writer Mary Roach explores the curious science of humans at war in her new book, 'Grunt.' She talks about medical maggots and stink bombs, and new scientific developments that help keep soldiers safe.