MICRO-DRONES. “Termed “smart dust,” these miniature versions of our contemporary drones are only a generation or two or three away from realization. In fact, they have been in development at DARPA for over twenty years. As originally envisioned by the geniuses at RAND, smart dust will eventually be a combination of “microeletromechanical” systems or MEMS.”
http://www.theascender.org/power-smart-dust/