I won't be satisfied with the robotics industry until I can send a swarm of nanobots to devour my enemies and turn them into fashionable singlets. While science plugs away at that problem, cool droids like the milliDelta from Harvard's School of Engineering and Applied Sciences (SEAS) will have to do. The robot is around 15mm², but can move with a degree of speed and precision that blows the pants off everything that's come before it.