Last weekend I took this puzzle, among others, to the National Math Festival in DC. It was, not surprisingly, a blast. My only sadness is I was so busy sharing the puzzles and games I brought that I didn’t get to see all the other spectacular presentations. I got to spend a lot of time with the folks from ThinkFun, from the Julia Robinson Festival nationwide, from Gathering for Gardner, and others, since we were all in the same section of the event. One big theme: the values of games in creating a math-positive culture at home… More