Meet the Air Walker: a 4-legged bot that uses suction cups and pumps to climb vertical surfaces. It can crawl in a straight line while moving its head back & forth. Kids can build 4 other models with the same parts. They get 75 components to play with.
More gadgets like this: here
You are going to need 3 AA batteries to power this robot. It is designed to give your kids hands-on experience in engineering and physics.
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