Insurance company gets naming rights
                                
                                
                                    (Newser) -
                                    An insurance company no one's ever heard of is suddenly a big name in Chicago.  Starting today, the Sears Tower—the tallest building in the Western Hemisphere—becomes Willis Tower, after Willis Group Holdings, the Sun-Times  reports. Chicagoans grumbling about the name change, which Willis earned by leasing just...