Drones have taken off across the globe, from the US to the UK.
The first World Cup, the 2020 Olympics, will be held in Tokyo.
And, if the Games are a success, there could be even more to come.
But what is a drone?
And how will it affect the lives of thousands of spectators?
In this story, we look at the history of drones, how they are being used in the sport of sport, and what we can learn from their successes and failures.
This story originally appeared in the February 2015 issue of New Scientist magazine.
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