The U.S. military’s top think-tank is thinking of ways to map and track potentially harmful drones over major American cities. Last month, the Defense Advanced Research Projects Agency announced the launch of the Aerial Dragnet program “to provide persistent, wide-area surveillance of all [drones] operating below 1,000 feet in a large city,” according to a DARPA … [Read more...] about DARPA Works on Drone Dragnet