make 25 machines that really work!
"This book breaks down how to build a variety of machines that solve simple problems in complex ways. Progressing in difficulty with each chapter, kids (and builders of all ages) will learn how to construct super simple machines that fit on a tabletop, to hard ones that take up entire rooms or yards! Learn how to start chain reactions that refill your popcorn automatically on movie night, open umbrellas, and even pack a picnic, one step at a time. Filled with famous quotes from Rube Goldberg, jokes, fun facts, and tips and tricks to make building as successful as possible, this book is sure to satisfy every family's most curious and inventive of minds!"--Provided by publisher.
