This image provided by AeroVironment Inc., shows a life-size hummingbird-like unmanned aircraft, named Nano Hummingbird, developed by AeroVironment Inc., for the Defense Advanced Research Projects Agency. The prototype has a wingspan of 6.5 inches, weighs two-thirds of an ounce and has a body shaped like a real hummingbird.(AP Photo/AeroVironment Inc.)
published Monday, February 28th, 2011







