Lift the flaps to learn how the human body works!Which muscle is the biggest? What happens when you sneeze? Which bone is the smallest? Find out the answers to these questions and more in First Facts and Flaps: My Busy Body. This book is full of flaps to lift, a wheel to turn, and a giant foldout that covers the digestive system, organs, senses, and more. With colorful illustrations and simple text, this book is the perfect introduction to the human body.