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Illus. in full color. A jam-packed amalgam of puzzles, experiments, optical
illusions, secret codes, and more are clearly explained in this brain-boggling
activity book. Every puzzle, trick, and project can be executed with safe,
inexpensive materials found around the home and the lively step-by-step
instructions make each activity easy to follow.
Grover describes ten ways to help the world, from planting trees to recycling trash.