Since the debut of Superman in Action Comics in 1938, fans have been thrilled by the adventures of the Man of Steel. In his book Superman: The Unauthorized Biography, comic book geek Glen Weldon explores the evolution of the superhero in comics, radio and small and large screen.
http://www.npr.org/2013/04/25/178850644/75-years-of-superman-the-man-of-steel-s-unauthorized-bio
