'The way things work guidebook' shows you how and why the amazing models you make actually work. Leonard and Mammoth take you through the fundamental principles. Simple explanations make you realize how incredible science really is. From levers and pulleys to pneumatics and robots. A hands-on fully interactive kit plus Pinball Science CD-ROM, a booklet, and activity cards. Construct 12 fantastic working models to bring David Macaulay's remarkable book to life.