EVANSTON, Illinois, July 17 -- Northwestern University posted the following news release:

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New spinning drone hides in plain sight

'Phantom Twist' harnesses motion blur to nearly vanish in flight

* Like a propeller, new drone spins too fast for the human eye to see clearly

* It's about 10 times less visually perceptible than a conventional quadcopter

* AI designed and optimized the drone, determinin . . .

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