This racy-looking 12-rotor coaxial multicopter has been filmed in Croatia pulling extreme rolls and loops, and carrying a human on board. Not at the same time, mind you, but still, to see a drone of this size pulling stunts like this is astonishing.

Assembling the wing from thousands of tiny identical pieces could make aircraft lighter and more energy efficient. How it works: The wing is made from an open, lightweight lattice framework that is covered with a thin layer of polymer material. It looks like thousands of matchstick-type struts welded together in small triangle shapes.