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

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

"A Colombian mathematician assembled these eighty brainteasers, forming a stimulating collection of word problems, puzzles involving chess pieces, sudoku-style

There are times in our lives when we're faced with insurmountable challenges. We stand at a crossroads, where our choice of which road to take decides not only

A comprehensive reference for psychology research and practice The Corsini Encyclopedia of Psychology and Behavioral Science, Volume 3 provides researchers, pra