The founder of Architecture for Humanity, a nonprofit that uses the resources of design to solve social problems, visited my brother’s class in architecture school and described one of the first design contests he held. He asked people to come up with the best design possible for a mobile AIDS clinic for a town in a country in Africa. He posted the deadline, and he waited. He didn’t think anyone would submit anything, but on the day of the contest’s deadline, a delivery man from Federal Express rang the doorbell to his tiny studio apartment in New York City. He was carrying a huge bag stuffed with envelopes. “Wow,” the founder said. “Are all those mine?” “No,” the delivery person said. He pointed to three giant Fed Ex trucks lined up on the street behind him, their hazard lights blinking. “All those are yours.” I really love that story. I think it reveals how human beings are waiting to make the world a better place. We just need to enter the contest.