In 1949, King Features Syndicate produced a giveaway book, sort of a quasi-comic, to explain how nuclear fission works. It starred Dagwood and his wife Blonde, with appearances by other King Features comic characters: Popeye, the Katzenjammer Kids, the Little King, and others. The science gets explained by Mandrake the Magician! It's only 36 pages long, and they are all scanned and enlargeable at The Ephemerist. Be warned, there's a quiz at the end. -Thanks, Tim!