Gardner Martin. Time Travel and other Mathematical Bewilderments

W.H. Freeman and Company, 1988. — 295 p. — ISBN13: 978-0-7167-1924-X.This book is another great collection of problems, discussions, and mathematical curiosities from Martin Gardner - and one of his best.
In this book, Martin Gardner has assembled an absorbing discussion on the theoretical aspects and possibility of time travel, including the many paradoxes that may arise; two problem collections to give to try out yourself and give to your friends; two chapters on tangrams and tiling each; along with 15 more chapters on interesting topics such as the melody-making machines, anamorphic art, block packing and more.Time Travel
Hexes and Stars
Tangrams, Part 1
Tangrams, Part 2
Nontransitive Paradoxes
Combinatorial Card Problems
Melody-Making Machines
Anamorphic Art
The Rubber Rope and Other Problems
Six Sensational Discoveries
The Csaszar Polyhedron
Dodgem and Other Simple Games
Tiling with Convex Polygons
Tiling with Polyominoes, Polyiamonds, and Polyhexes
Curious Maps
The Sixth Symbol and Other Problems
Magic Squares and Cubes
Block Packing
Induction and probability
Catalan Numbers
Fun with a Pocket Calculator
Tree-Plant Problems
Index of Names