Puzzle me this!: GeekDad Puzzle of the Week Answer: Gear Up

Piaget's developmental stages should certainly include mention of the age at which kids learn to build with Lego gears. And then the next stage would be understanding them. This week's puzzle required both.

Source: http://www.wired.com/geekdad/2012/09/geekdad-puzzle-of-the-week-answer-gear-up/

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