Happy Birthday to the most popular children's book writer in American history, the best-selling children's book writer of all time, and the man who revolutionized the way children learn to read: Theodor Geisel, better known as Dr. Seuss; born in Springfield, Massachusetts, on this day in 1904. He's the author of more than 60 children's books, including Horton Hears a Who! (1954), One Fish, Two Fish, Red Fish, Blue Fish (1960), Green Eggs and Ham(1960), Hop on Pop (1963), Oh, the Thinks You Can Think!(1975), The Butter Battle Book (1984), and my personal favorite, The Cat in the Hat (1957)... Thank you, Dr. Seuss!