0I Know Things That Go invites kids to discover the big and fascinating world of vehicles - over 50 different kinds of machines Kids will love lifting the flaps and learning how various vehicles work and what they do. The book has 40 sturdy flaps to lift featuring colorful kid-friendly illustrations that introduce new concepts and vocabulary in a simple way. Clever Questions is an innovative non-fiction series that includes 4 titles about the most popular subjects; vehicles; weather and climate; sports and the world around us. The handy square size and the high quality board pages with round corners make this series a perfect way to discover the world and how it works.