THE BONES BOOK AND SKELETON includes a 12-inch, 24-piece skeleton and a book. The skeleton is realistically designed with moving joints, and can be displayed in its clear plastic bell jar. Learn using hands-on activities and discover the answers to questions such as “Why do you shrink during the day and grow at night?” and “How do broken bones heal?” and much more! The book is packed with projects, experiments, and facts about all the systems of the human body. The focus, of course, is on the bones—what they are made of, how they grow, how they work.