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...
Meanwhile, Troy is hard at work getting his old partner Pickle back into fighting shape. Together, they aim to tackle the growing threat of the pythons in their territory. Not to be left out, Bruce and Kaylyn return to a monster’s den, where they’ll face even greater challenges in their quest to rid the swamp of these menacing creatures.