These "micro aerial vehicles" - no larger than a common house fly - have been in development for over a decade.*One of the major hurdles was creating sufficient battery power in such a small object, as well as keeping them light enough to remain airborne.
The robots are used in spying missions, where they quite literally serve as a "fly on the wall" - recording and transmitting audio-visual information. An individual robot is equipped with miniature cameras, microphones, modem and GPS. A number of terrorist cells are being infiltrated thanks to this new technology.
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