SLP2001050805 - 08 MAY 2001 - ST. LOUIS, MISSOURI, USA: Comedian George Carlin laughs during a radio interview while doing a book signing in Forest Park in St. Louis, Missouri, May 8, 2001. Carlin is on a 12 day, 12 city tour for his new book, "Napal and Silly Putty." rlw/bg/Bill Greenblatt UPI