f the soldier-like perfection of the synchronized formation by these mini drones doesn’t freak you out a bit — their collective buzzing sure will. Orchestrated by the GRASP Lab at the University of Pennsylvania, these 20 “nano quadrotors” developed by KMel Robotics seem to, as Popular Science describes, sense each other’s proximity and work together to maintain formation “like a hive of bees moving en masse.” Watch the drone swarm in varying formations and with obstacles (Note: Hold out for the figure eight at 1:27):