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In Pictures: The 31 weirdest, wackiest and coolest...
Refueling an aircraft while it is flying can be a tricky-enough proposition but refueling an unmanned jet from another unmanned jet sounds like a scene for a James Bond movie. But such a tricky procedure is apparently within reach as the Defense Advanced Research Projects Agency this year said it successfully tested the technology needed to fly two drones close enough together in mid-air, at speed that one, acting as a tanker aircraft, could successfully refuel the other.
In Pictures: The 31 weirdest, wackiest and coolest sci/tech stories of 2012