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Simple machines are all around children - bicycle wheels, doorstops, the seesaw on the playground. This captivating series opens young readers' eyes to the essential everyday simple machines in their world. Easy-to-follow text engages kids in learning how levers, wheels and axles, inclined planes, pulleys, wedges, and screws work. Set of 6 books, 32 pages each. paper back. Grades K-3.