From the archives: Two interviews with Charles D. Cohen, the world's greatest expert on Theodore Geisel, aka Dr. Seuss. First is a 2004 conversation about his book "The Seuss, the Whole Seuss, and Nothing but the Seuss," which explores Geisel wide-ranging career. Second is a 2007 interview about the 50th anniversary edition of "How the Grinch Stole Christmas."