The Brick Experiment Channel posts videos about doing interesting things with Lego bricks. Last year they made a gear train with 186 Lego gears. The motor spun at 375 RPM. Each gear reduced the RPM. The fourth gear spun at 1 RPM. The final gear ratio was 1.034 googol:1.
The latest video goes in the opposite direction. They use gears to see how fast they can make a wheel spin from hand power only. They did a good job, reaching over 19,000 RPM.
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Watch a real cat's bewilderment when it meets a look-alike cat built out of Lego. The Tuxedo cat in the video pounces around the lego cat when it first sees… READ THE REST
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