Riley Howell 'took the assailant off his feet': police
                                
                                
                                    (Newser) -
                                    A North Carolina college student tackled a gunman who  opened fire  in his classroom, saving others' lives but losing his own in the process, police said Wednesday. Riley Howell, 21, was among students gathered for end-of-year presentations in an anthropology class at the University of North Carolina-Charlotte when a man...