Engino Discovering Stem Mechanics Gears & Worm Drives | 12 Working Models | Illustrated Instruction Manual | Theory & Facts | Experimental Activities | Stem Construction KitKids Learn How Gears Can Reduce Or Increase Speed And Learn How Worm Drives Are Used To Change Rotational Speed. Build 12 Working Models Such As An Experimental Crane, A Helicopter, A Gearbox And More. Easy To Follow Instructions + Includes 16 Pages Of Theory And Amazing Facts With Explanations Of The Different Scientific Principles Accompanied By Fun Experiments To Test Newly Acquired Knowledge. A 3 Page Quiz Section Is Also Included. Chosen As One
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Engino Discovering Stem Mechanics Gears & Worm Drives | 12 Working Models | Illustrated Instruction Manual | Theory & Facts | Experimental Activities | Stem Construction Kit