Jim Fixx
This delightful companion volume to the best-selling ,Games for the Superintelligent, lets you match wits with master problem solvers in a fascinating collection of math, logic, and word puzzles that at first glancemay seem impossible to solve. But don't be intimidated. You may be surprised to find that persistance and a dash of creativity will yield results. (If not, the soltions are listed at the back of the book!)
Nonfiction
More Games for the Superintelligent