Presents a collection of puzzles that demonstrate the principles of mathematics.

Calculate velocity; explain the Maltese cross mechanism that's the basis of the motion picture projector; and work out the ways different pendulums (including F

Problem solving is a pleasure - when you can get rid of those mental blocks. That's just what this collection of puzzles helps you do, even as it offers hours o

A colorful square, dissected into four parts, with hinges marked in black. If you leave the blue piece fixed and swing the others around their hinges, a new sha

Presents a collection of puzzles that focus on mathematical concepts.