We’re used to seeing political pundits on our television screens predicting future events – who will win an election, whether a war or social unrest might break out, whether an international treaty will be signed. How accurate are these forecasts? Well, this is something Philip Tetlock has studied, and it turns out, not very. And oddly, the more famous the pundit, he says, the worse their predictive record. Presented by David Edmonds (Image: Crystal ball, Credit: Shutterstock)