There is a big gap between “concept" books written for preschoolers and nonfiction that requires flu- ent reading skills. The Cat in the Hat's Learning Library® books introduce beginning readers to important basic concepts about the world we live in. They provide the critical foundations upon which complex facts and ideas can eventually be built. In addition,The Cat in the Hat's Learning Library® shows young readers that books can be entertaining and educational at the same time. This is a wonderful series! ——Barbara Kiefer, Ph.D., Charlotte S.Huch Professor of Children's Literature, The Ohio State University LEARN TO READ.READ TO LEARN.