Micro helicopters, the kind that fit in the palm of your hand (and sometimes spread holiday cheer) are huge fun -- and hugely frustrating. Have you ever tried to get one to hover in place next to another? Impossible! MIT thinks it can do that, not with just two but thousands of the little beggars all hovering in harmony as part of a project called Flyfire. By using LED-equipped drones the project pledges to build free-floating 3D displays, endowing them with enough smarts and positional aware
