A look at the future world of drones: Expert explains how cities will change once unmanned craft become normal

Amazon has been busy testing out its new Prime Air initiative at a secret location in the English countryside. The service's promise of a 30-minute delivery by specially designed drones may look like click-bait PR, but it's an early sign of the significant changes coming to cities around the world. For the moment, much of the hype around drones is full of caveats: safety is always the first priority, and nobody quite knows the full extent of what's possible. Amazon has been busy testing out its new Prime Air initiative at a secret location in the English countryside. This undated image provided by Amazon.com