The new industrial revolution begins with the click of a mouse. A few years ago, Chris Anderson, the 51-year-old editor-in-chief of the American technology magazine Wired, became fascinated by drones. His drones were geeky toy versions of the Predators that patrol Pakistani airspace – scaled-down, homemade and de-weaponized. He started a website – DIYDrones.com – which attracted thousands of other enthusiasts, and he decided that it would make sense to start selling build-your-own drone kits. And then he had his epiphany.