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mechanics
Outer space: Cushioning the blow
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The story of the Gömböc
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Going up in the world
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Defying gravity: The uphill roller
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Outer space: Wagons Roll
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Old problem, new spin
Have you ever noticed what happens when you spin a coin on a table? As the coin starts to fall over and roll on its edge, its spin gets faster and faster until it suddenly stops altogether.
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