A group of engineers at Harvard University has created a tiny bee-sized flying robot -- the first of its kind to take flight without the assistance of guide rails. The tiny bots -- whose wing movements mimic those of a common housefly -- are still limited by their need to remain tethered to a power supply, but scientists say that with enhanced maneuverability, such drones could one day be used for search and rescue, environmental monitoring and even crop pollination.

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