The Colossal Book of Short Puzzles and ProblemsFor more than twenty five years, Martin Gardner was Scientific American's renowned provocateur of popular math. His yearly gatherings of short and inventive problems were easily his most anticipated math columns. Loyal readers would savor the wit and elegance of his explorations in physics, probability, topology, and chess, among others. Grouped by subject and arrayed from easiest to hardest, the puzzles gathered here, which complement the lengthier,