The General Robotics, Automation, Sensing, and Perception (GRASP) lab at UPenn posted a video with nano quadcopters showing remarkable agility and the ability to perform as a team.
CNet – The quadcopters are able to flip over and maintain flight. More amazing (unnerving?) is their operation in formation. Based on commands, 16 quadcopters change direction, land, navigate past obstacles, and even fly in a figure-eight formation.