Drone swarms are groups of drones that fly and move together. They are used in China as alternatives to fireworks and in dazzling light shows at Disney Parks. In the dark, lights on the drones can look like fireworks that move and light up in ways that defy physics. Beyond light shows, drone swarms are used in military operations and in reconnaissance missions. Future swarm technology could use what Nora Ayanin, a roboticist at the University of Southern California, calls “leveraging diversity in the control policy,” where each drone is programmed slightly differently, so the one best suited to the task teaches the rest of the swarm how to act.