Grover's 10 Terrific Ways to Help Our Wonderful World (Sesame Street)
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.  --This text refers to an out of print or unavailable edition of this title.