Table of Contents

Preface; 1. Penrose tiling; 2. Penrose tiling II; 3. Mandelbrot's fractals; 4. Conway's surreal numbers; 5. Back from the Klondike and other problems; 6. The Oulip; 7. The Oulip II; 8. Wythoff's Nim; 9. Pool-ball triangles and other problems; 10. Mathematical induction and colored hats; 11. Negative numbers; 12. Cutting shapes into N congruent parts; 13. Trapdoor ciphers; 14. Trapdoor ciphers II; 15. Hyperbolas; 16. The new Eleusis; 17. Ramsey theory; 18. From burrs to Berrocal; 19. Sicherman dice, the Kruskal count and other curiosities; 20. Raymond Smullyan's logic puzzles; 21. The return of Dr. Matrix.

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Another superb collection of articles from Martin Gardner, the king of recreational mathematics.