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The Momentum 360 Centrifugal Hand Spinner is Officially Announced
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The Physics of Fidget Spinners: Explaining the Moment of Inertia | WIRED
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Momentum 360º: Centrifugal hand spinner! | Indiegogo
Momentum 360º: Centrifugal hand spinner! | Indiegogo
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Momentum 360º: Centrifugal hand spinner! | Indiegogo