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Jim Karol presents several interactive features(1) on his site, including a game called NIM(2), in which the goal is to make your opponent draw the last 'matchstick.'
1. http://www.mindwiz.com/games/index.html2. http://www.mindwiz.com/games/nim.html
Mark Alpert spoke on the dangers of science going too far. Followed by Open Lines in the latter half.