The fireman robot is very helpful and should be in every home. The robot has digital IR sensors that help it find fire, DC motors that help it move toward the fire, and a DC tiny fan to put out the fire.
Bristlebots are kids' easiest robots. It uses toothbrush heads, pipe cleaners, a small watch battery, double-sided tape, a vibrating pager head motor, and optional craft eyes. The robot walks without falling.