Michael Mosley explores the latest science about how our personalities are created - and whether they can be changed.
                                        
                                      Despite appearances, Mosley is a pessimist who constantly frets about the future. He wants to worry less and become more of an optimist.
                                        
                                      He tries out two techniques to change this aspect of his personality - with surprising results.
                                        
                                      And he travels to the frontie...
                            
(展开全部)
