Only in the last 200 years have humans learned how to make things cold. Steven Johnson explains how ice entrepreneur Frederic Tudor made ice delivery one of the biggest export business in the U.S. and describes the place where Clarence Birdseye, the ... (more)father of the frozen food industry, experienced his eureka moment. He also travels to Dubai to see how mastery of cold has led to penguins in the desert. From IVF to food, politics and Hollywood to human migration, the unsung heroes of cold have led the way.