Watch the video, then think of the applications.
Try not to get too paranoid. Cruise missiles used street mapping technology to pinpoint targets in the first Gulf War, which is a small solace for those of us with imaginations whetted by too many Philip K. Dick books or school debating teams. Technology: our servant or our master?, etc.
Freaky, perhaps scary. Definitely likely to be turned to sinister purposes. The little dudes are nano-cute though….
Experiments performed with a team of nano quadrotors at the GRASP Lab, University of Pennsylvania. Vehicles developed by KMel Robotics.