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Michael Mosley exlores the latest science about how our ersonalities are created - and whether they can be changed.\r\n Desite aearances, Mosley is a essimist who constantly frets about the future. He wants to worry less and become more of an otimist.\r\n He tries out two techniques to change this asect of his ersonality - with surrising results.\r\n And he travels to the frontie...