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...
In a land of swords and sorcery, bandits break from their gang to protect a little girl, pitting them against their old friends and former leader who was once like a father to them.