On this edition of “60 Minutes,” Scott Pelley investigates U.S. government officials reporting mysterious brain injuries. Correspondent Anderson Cooper profiles Kevin Hart, the highest grossing comedian today and bankable movie star, who is now adding a new title to his resume – entertainment and business mogul. Cooper goes backstage with Hart in Pasadena, California to watch him test out new material for an upcoming comedy tour and sits down with him at his headquarters in Los Angeles to talk about the business of being funny and his growing empire.