A flashing key chain, a bouncy toy animal, a super-secure alarm box---your kids will love making and using these gizmos! Budding engineers will learn how things work as they build the six awesome gadgets in this book. Each project includes a materials list and step-by-step instructions. Features 'How-To Tips' and a 'What's That?' glossary. Ages 9 to 14. 64 pages, softcover from Greey de Pencier.
