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...
Follows the Mackenzie Shirilla case, a 17-year-old who intentionally crashed her car into a brick wall in Ohio, killing her boyfriend Dominic Russo and his friend Davion Flanagan. She was convicted of 12 felonies.
An unflinching portrait of Dean Potter, the influential and controversial climber, base jumper and highline walker, who achieves jaw-dropping feats while battling his inner demons.