On the fourth floor of the University of Arizona’s College of Education, 40,000 books tell the stories of children and teens from around the world. Sunlight streams through windows showcasing views of the Catalina Mountains, and window benches beckon, welcoming students studying or children curling up with a picture book. The Worlds of Words: Center for Global Literacies and Literatures is the largest global collection of children’s and young adult books in the United States.