Replays. Last Monday we learned to play the game of Nim, and the strategy that lets you win every time. Here’s the slide show from the event, and the video replay.
Teach it yourself. For tips on teaching Nim, see this fabulous video and lesson plan by math educator Dan Finkel.
Go deeper. There’s a clever winning strategy for general Nim, which relies on the base 2 representation of numbers. Watch this video from the ever-charming James Tanton. It’s substantial mathematics, but if you understand base 2, you can follow it.