Uploaded August 2026 | Updated September 2026, 2 weeks ago

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A new drone technology is emerging that can make itself almost impossible to see — and in some cases, impossible to hear.Researchers at Northwestern University have developed a drone that becomes visually imperceptible when it spins at high frequency, essentially blurring itself out of human perception. But that's only half of the stealth drone story. A separate breakthrough — the four-gram "Coulomb Fly" — uses electrostatic and electrohydrodynamic propulsion to fly with no moving parts and virtually no sound at all.

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