New Spinning Drone Hides In Plain Sight
To design invisible drones, researchers have tried camouflage, transparent materials and light-bending optical systems. But engineers at Northwestern University used “motion blur,” which an announcement from the school notes is the effect that makes fast-spinning fans seem to disappear.

“The drone spins up to 25 times per second, which is too fast for the human eye to see clearly. While it isn’t … ⌘ Read more