There's nothing better to spark your child's scientific interest than Green Science's educational experiment toy. The saltwater robot is guaranteed to delight your little tinkerer. Assemble the individual parts with your little up-and-coming lab assistant to create a moving robot. The special highlight: The saltwater robot does not need any batteries at all. Electricity is generated by the reaction of salt water, which must be added as fuel, and activated carbon. Take the robot to the beach and find out for yourself how far it can travel!