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For decades, unpersoned planes have been used by the military in places such as Afghanistan and Pakistan to watch the ground and deliver weapons controlled by remote pilots thousands of kilometres away. But now companies and experts are putting their minds to turning military drones into civilian vehicles that can do things cheaper and better than piloted planes. Peter Day investigates unmanned aerial vehicles and how they are already being used by farmers and the police. Also, could a drone be delivering your pizza in the not too distant future?