Build five fun gadgets and learn about gears and transmissions.
Create a helicopter model with a rotor that spins using a rubber band-powered motor.
Assemble a spinner toy that you wind up to launch a fast-spinning top. Make a centripetal force machine that flings its arms outward at high speeds.
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Build a hand-mixer that demonstrates a gear train.
Construct a cool aircraft launcher that flings a model vehicle across the room on a zipline.
A 28-page manual guides your model building and experiments with step-by-step illustrated instructions.
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