## Math Puzzle Wiki

I enjoy using mathematical puzzles as a teaching tool. To that end, I have started a collection of my favorite puzzles (including the one above) on what I'm calling the Math Puzzle Wiki. It is intended primarily for fellow math teachers as a resource for in class activities and extra credit problems but it might also be interesting to puzzle enthusiasts. You are welcome to add puzzle or improve ones already there.

## Puzzles in Research

As an example of how math puzzles can become math research, you might be interested in a recent math talk on counting liars and truth-tellers I presented at the Joint Mathematics Meeting in January 2012. A paper on this topic was recently published in the College Mathematics Journal.