Posted on June 05, 2015 Five Circles PuzzleIs it possible to draw five circles over a grid of 5x5 points so that at least one circle passes through every point?
| Posted on June 16, 2013 TEDx SeattleI will be speaking at TEDx Seattle on June 23rd 2013.
| Posted on October 03, 2012 Logic Puzzle - Gunman and colored dotsCan you use logic to save your life and determine the color of a dot painted on your forehead?
| Posted on December 08, 2013 Why do pipes burst the way they do?Have you noticed that when pipes burst, they almost always burst the same way?
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