index.

Make a folding tetrahedron -- Six pyramids make a cube -- Three pyramids make a cube -- Shisei mystery -- Car jam -- Flight controller's nightmare -- Vanishing act -- Mystifying match sticks -- Calculator cricket -- Generating straight-line motion -- Make a mobile to defy gravity -- Triangular building site -- Ring the triangle -- K9 or one man and his dog -- Anti-litter campaign -- Railcar terminus -- Paving the patio -- Make a twistable tetrahedral torus -- Seeing is believing! -- Spot the pattern -- Investigations on a 5X5 pinboard -- Chessboard tours -- Mind stretching.

Provides over 100 investigations, puzzles, practical activities, and games to encourage mathematical thinking. Includes solutions and additional project ideas.