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The guy is into domino computers now. He made an xor gate! I think he know as much about as logic gates as he does, so I gotta do some Wikipedia night reading.
If you have a math-interested kid, I gotta say, these two books, along with all of Ben Orlin's books, have elicited a "wow!" every five pages:
- How to Invent Everything
- Things to Make and Do in the Fourth Dimension