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Recreate a lunar landing in your kitchen with the 4M Zero Gravity Fridge Rover. The gravity defying Fridge Rover will move over any magnetic surface with amazing ease. All you have to do is wind it up and watch it go. Inside the Rover's clockwork mechanism is a coiled spring that winds more tightly as you turn the handle; this stores energy in the spring (potential energy). When you let go, the spring uncoils, releasing the energy again and making the wheels turn (kinetic energy).
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