Theodor Seuss Geisel, is known for his work writing and illustrating more than 60 books under the pen name Doctor Seuss. His work includes many of the most popular children's books in history, with over 600 million copies of his books sold in over 20 languages. Many of us grew up on his wacky characters and gorgeous rhymes. Did YOU? If so, can you remember, or even, guess these rhymes by Doctor Seuss?