They say that one day robots and computers will be able to do things better than humans can. This pair of flying machines can already play tennis better than I can. Granted that’s not saying much on my part, but still the video at the link is really impressive.
Mark Muller, Sergei Lupashin and Raffaello D’Andrea worked as a team in ETH Zurich’s Flying Machine Arena for an experiment which is part of the project by ETH Zurich. Quadrocopter can play Tennis and they play really well vertically , that's pretty amazing.