It's not easy to teach drones to fly quickly and safely. You usually have to create an elaborate proving ground with real obstacles, and a single mishap could prove very costly. MIT's solution? Have the drones fly around imaginary objects. The school's engineers have created a virtual testing ground, nicknamed Flight Googles, that has drones flying through a simulated landscape in the safety of an empty room. Motion capture cameras around the space track the orientation of the drone and help the system send realistic, customized virtual images to the drone to convince it that it's flying through an apartment or another obstacle-laden environment.