Donald uses a computer to ad-just electrical charges on the grid, thereby controlling its direction
and speed. When he increases the charge, an actuator on the machine's tail becomes oppositely charged and thus attracted to the plate, causing the tail to flex and make contact with the grid's surface. This pushes the shorter front leg 10 nanometers forward. At its fastest, the robot can take 20,000 steps a second. The next challenge is to assemble teams of robots to perform far more complex tasks, such as fixing your PC.