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Another Gear Idea

Derek, a new employee at the Museum and a local teacher in Pittsburgh, presented a great idea to me a couple of days ago.  He wants to make a mechanical version of our circuit blocks.  He thinks that it is important to utilize various types of gears to create blocks that visitors can connect together to further explore mechanization.  To explain this concept only in words is very confusing. A couple of Sundays ago, D
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