Summer's number one show is back, with the amazing, the terrible and the absolutely absurd ready to hit the stage for your votes on America's Got Talent. And though the judging panel of Simon Cowell, Howie Mandel, Mel B. and Heidi Klum returns intact, season 12 comes with one glaring change.Longtime host Nick Cannon, who year after energetic year was unjustly overlooked in the Emmy conversation, is out after eight years following a dispute with NBC. He has been replaced by mogul Tyra Banks, who certain...