The most popular children's book in 1950 was probably "The Cat in the Hat" by Dr. Seuss. It was published in 1957 but became popular very quickly. It has a timeless appeal that has made it a classic, not just among children but adults as well. The book follows the misadventures of the Cat in the Hat, a mischievous character who visits two children, Sally and her brother, on a rainy day. It is full of wacky antics and silly characters that have enchanted readers—both adults and children—for decades. In addition, the iconic illustrations and rhymes are also part of the book's charm and make it a timeless classic for generations. Besides being a favorite among children, "The Cat in the Hat" has been used in many educational settings, including classrooms and libraries.