I was cleaning out some files the other day and came across a brain twister. I suspect the puzzle came from the Edward de Bono lateral thinking seminar I attended some 30 years ago. It must have made an impact on me because not only did I save it, I also used it as a warm-up exercise at a couple of out-of-the box, new product brainstorm sessions. The best way to approach any brain twister is to free the mind and allow it to function “laterally” rather than vertically or logically. And by the way, the more people devoted to the task, the faster the solution. What does that tell you?