Instead of costly camouflage or advanced stealth technology, Northwestern University researchers designed a drone whose entire body spins up to 25 times per second, turning it into a faint blur that is about 10 times harder to see than a conventional quadcopter The technological race to develop drones and unmanned aircraft has long moved beyond speed and flight range. Increasingly, it is focused on the art of remaining unseen. While defense companies worldwide invest heavily in complex systems intended to c... [5236 chars]
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