Captain Marvel Jr. #86 June 1950 (The Golden Egg)

The World's Mightiest Boy seems a bit dumb or at least unobservant in this story. The Blue Boy does comment (p. 4) that Professor Ellis (actually Doc Dugan) changed his clothes. However he doesn't notice it is the same green suit (with yellow polka-dot bow tie) the crook Dugan was wearing. This tales has some educational value as Captain Marvel Jr notes, "Tiny flecks of gold exist in the dirt! And all the birds eat a certain amount of dirt for rummage! Thus the gold flecks they gobble up get into their shells!"  Art by Joe Certa. Script by Otto Binder (GCD).