Tim Harford tells the story of Thomas Schelling, an economist who helped America and the Soviet Union to avoid nuclear war.

Tim tells the story of Al Roth, who worked out how to create a clearing-house for kidneys.

Tim Harford weaves together economic ideas with remarkable personal histories in some unusual locations. The presenter of Radio 4's More or Less speaks to an audience from a shop window on London's Regent Street, and turns his attention to heated pants and the business of innovation. He tells the moving story of Mario Capecchi, whose struggle to get funding for his experiments tells us much about where new ideas come from, and how to foster them.