The most exciting new idea for tackling poverty and feeding billions around the world has got nothing to do with hydroelectric dams or back-slapping summitry. Instead, this one begins with a story about kung-fu movies. In the mid-90s, Claire Melamed was working in a village in the far north of Mozambique. Nacuca had no electricity, nor running water, and precious few distractions. As the development economist recalls: "Villagers would ask, 'We have to live here, but how come you've chosen to stay?" Then one day visitors came, bearing entertainment.