Multiplying my age by 6 then subtracting 6 produces the same result as subtracting 7 from my age then multiplying by 7. How old am I? On my broken calculator wi

Treasury of 300 puzzles features 3D and chess puzzles, connections, dissections, foldings, geometrical and number puzzles, logic problems, matchstick puzzles, m

This brand-new puzzle book features 200 logic questions of varying types and difficulty. Mental workout warriors and logic lovers will adore The Everything Book

These 300 original and full-color exercises include 3-D puzzles, chess puzzles, connections, dissections, foldings, geometrical puzzles, logic problems, matchst

EFT (Emotional Freedom Techniques or "tapping") is used by an estimated 10 million people worldwide. Yet a lack of standardization has led to a field in which d