There’s a common belief about the mental acuity of the aging brain: "If you don’t use it, you lose it.” Research published in the December 20, 2006 issue

The next book in Good Year's Sudoku series

These popular logic puzzles from Japan are taking the world by storm. Sudoku looks like arithmetic but requires just logic. While the rules are simple, the solu

Put your brain to the test in Super Sudoku with these 500 puzzles.