We can think of no possible way that a newly invented invisible drone can be used nefariously.
Rather than relying on camouflage, the flying gizmo created by researchers at Northwestern University exploits the motion blur effect in our fallible human vision to almost disappear by spinning at an absurd 25 times per second.
This is too quick for us and many animals to see clearly, becoming a gossamer smear that blends into the background, like the way the blades of a helicopter do, only more extreme.
One day, this type of design could be used for completely peaceful pursuits, the researchers say — like observing wildlife, of course.
