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Making a GOOGOL:1 Reduction with Lego Gears

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3 Amazing Magnetic Accelerators | Magnetic Games

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Shredding Paper with Lego Gears (ver 2)

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7 Types of Wheels and Hard Trials - Experiments with Lego

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3D Printer Gearbox - Spinning it FAST

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Build & Test Lego Engines: V8, U12, H16, X24, multirow-radial-42, S100