Matt Keennon, program director at AeroVironment, demonstrates a tiny, drone aircraft known as the "nano-hummingbird," during a briefing at the company's facility in Simi Valley, Calif., Friday. With a 6.5-inch wing span, the remote-controlled hummingbird plane weighs less than an AA battery and can fly at speeds of up to 11 mph, propelled only by the flapping of its two wings. It can climb and descend vertically, fly sideways, forward and backward, as well as rotate clockwise and counterclockwise, and hover. (AP Photo/Reed Saxon)