Classic Critical Thinking Puzzles

Suppose you have only two egg timers, a five-minute and a three-minute. Can you use these two measuring devises to time an egg that must be boiled for exactly two minutes?This is only one of the many brain-baffling critical thinking puzzles inside. While you may never need to time a boiling egg in this manner, solving puzzles like these can sharpen your problem-solving skills. Even better, you'll enjoy the challenge of completing page after page of mind bogglers.