<human>:  How does the Peanut Butter Robot work?
<bot>: The Peanut Butter Robot is a robot that can spread peanut butter on bread. It is powered by a small battery, and has a small motor that drives a gearbox that turns a screw to move a piston up and down. The piston pushes peanut butter out of a nozzle on the top of the peanut butter robot.