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LEGO Technic Gear Ratios
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FAQ: What is the relationship between the number of teeth on a gear and it's radius?
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Get Into Gears, Part 1 - LEGO Education
Making a GOOGOL:1 Reduction with Lego Gears - YouTube
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LEGO Gearwheels For Beginners (Episode 3) - YouTube
Gearing Ideas and Notes at MROB
