Construct ten out-of-this-world machines and learn about the physics of levers and linkages. A battery-powered motor box powers the models. Make a creepy slithering alien snake-bot model with rotating arms and articulating tail. Build an alien insectoid-bot that crawls on six legs. Create an alien Raptor model with wings that move up and down. Assemble a cool grabber claw with a scissors mechanism. Make a bipedal alien robot model that walks on two legs. In addition, build models of a pump Jack, swinging device, hopping alien frog- bot, roving dyno-bot with reciprocating arm, and rolling alien dragon-bot. A 28-page manual guides your model building and experiments with step-by-step illustrated instructions.