Ron Fearing has the future of warfare at the tip of his finger (photo of a fly-sized winged-vehicle the size of a paper-clip). It isn’t pressing on the trigger of a laser death ray or button of a doomsday device. It’s holding a stubby-winged mechanical bug. “Flies are one of the most stable and maneuverable of all flying animals,” says the University of California at Berkeley biologist. “They are the jet fighters of the animal world.” The Pentagon shares this opinion and wants to turn these Bizzaro World duplicates of houseflies into real jet fighters. The Berkeley team is one...