Bringing people of different ages and social status together may help you think in new ways. Edwin Land, one of America's most productive inventors, claimed the idea leading to his invention of the Polaroid camera came from his three-year-old daughter. On a visit to Santa Fe in 1943, she asked why she couldn't see the picture he had just taken. During the next hour, as Land walked around Santa Fe, all he had learned about chemistry came together, "The camera and the film became clear to me. In my mind they were so real that I spent several hours describing them." Expand your world.