21.   Robonaut is more correctly categorized as a tele-robot, a machine that moves and performs tasks in response to the commands of a human operator.

22.   The EDS machines use a computer to scan the bag, because of fear that a human operator would become bored and miss signs of bombs.

23.   The same rear-view mirror can also display e-mail messages sent by the Internet or text messages passed on by a human operator.

24.   Unmanned attack craft would require human operators to ensure that the right targets are hit, Churchman said.