Indeks : p. 44-45 ; There is a big gap between “concepts” books written for preschoolers and nonfiction that requires fluent reading skills. That cat in the hat’s learning library books introduce beginning readers to important basic concepts about the world we live in. they provide the crtical 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.