Forget the hype that Amazon and Google are generating with their experimental drone delivery services, NASA claims that it will be at least five years before the autonomous flying machines are safe enough to fly even in sparsely populated areas.
There may be a lot of buzz around drones at the moment, but, according to a group of NASA researchers, there are far too many technological and regulatory hurdles for them to overcome before they will be allowed to make deliveries in major cities.
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