The PD-100 Black Hornet 2 is a high-tech camera drone that’s currently being tested by the US military. Unlike consumer drones used by photographers, such as the DJI Phantom or Inspire, the PD-100 is designed to be extremely stealthy: it fits in the palm of your hand, and weighs just 18 grams — about the same as 3 to 4 sheets of ordinary printer paper. Oh, and they cost $40,000 each.
