DARPA (Defense Advanced Research Projects Agency) continues progress on their hummingbird spy drone. The latest prototype runs for 8 minutes, a big leap from the previous 20 seconds. Only a few grams heavier than an actual hummingbird, the robot, in flight, looks just like the real thing. It flies up, down, left, right, and can turn on a dime. This drone, once completed, will make an excellent spy, in areas where hummingbirds are a common sight...