A beach ball-size drone can fly down narrow alleys, hover on the spot, take off vertically, bounce along the ground like a soccer ball -- all the time transmitting live images from a video camera; it can travel above traffic or spy on a target through a window -- and can also be used in search and rescue in disaster zones, where it could fly through buildings and even up and down stairways.
> http://www.homelandsecuritynewswire.com/beachball-observation-uav-developed
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