Happy 109th birthday, Dr. Seuss! The legendary children's book author single-handedly transformed lil ones' bookshelves, writing more than 44 books that rhymed their way into kids' (and their parents') hearts. Now, he's transforming our iPhones and iPads with visually stunning apps that are entertaining and educating a new generation of Seuss fans. In honor of Theodor Geisel's birthday, and the release of The Lorax, Oceanhouse Media is putting most of their Dr. Seuss app collection on sale. Happy Birthday to You! on sale for just $3, and other games and books will be offered for free! Keep reading to see our celebratory picks!