Contributor(s): Tim Harford | Tim Harford combines biology, statistical physics, psychology and of course economics to explore how complex problems are solved, and the crucial role of learning from our apparently endless ability to screw up. Tim Harford is the author of Adapt| and The Undercover Economist. He is a senior columnist at the Financial Times, presenter of Radio 4's More or Less, and a visiting fellow at Nuffield College, Oxford.