- DC (Post-Crisis), DC (Post-Zero Hour): Nathaniel Adam, later Captain Atom, is born. (Captain Atom #1)
- Real World: May 10. Nazi Germany invades Belgium, the Netherlands and Luxembourg. Winston Churchill becomes Prime Minister of the United Kingdom.
- GURPS Infinite Worlds: May 10. The history of Reich-2 diverges from Homeline's history when Lord Halifax becomes Prime Minister of the United Kingdom. (GURPS Infinite Worlds)
- Real World: May 25. The Battle of Dunkirk begins in France. The next day, Allied forces begin a mass evacuation from Dunkirk.
- GURPS Infinite Worlds: June 4. The history of Reich-1 diverges from Homeline's history when the British Expeditionary Force is destroyed during the Battle of Dunkirk. (GURPS Infinite Worlds)
- Real World: November 1. The Lascaux caves are discovered in France, which contain paintings made by early humans over 15,000 years ago.
- DC (Generations): Dick Grayson's parents are killed, and he is adopted by Bruce Wayne; soon thereafter, Grayson becomes Robin. (Superman & Batman: Generations)
- Indiana Jones (Expanded Universe), Star Wars (Expanded Universe): c. 1940 (125 ABY). In an alternate timeline, Indiana Jones is led by Native American guides to the wreck of the Millennium Falcon while searching for a legendary sasquatch. (Star Wars Tales #19; although it seems to be implied (mainly due to Short Round's presence) that this takes place around the time of Indiana Jones and the Temple of Doom, Jones mentions his visit to Atlantis. Since there's an open slot in the Indiana Jones timeline in 1940, and Short Round could conceivably be five years older here, we can presume this date. See 1814 for the Star Wars dating.)
New Fictional Works
Synthetic Men of Mars by Edgar Rice Burroughs.
The Ape, Before I Hang, Beyond Tomorrow, Black Friday, Charlie Chan in Panama, Charlie Chan's Murder Cruise, Dr. Cyclops, Drums of Fu Manchu, Flash Gordon Conquers the Universe (serial), Green Archer (serial), Hi-Yo Silver (serial), The Invisible Man Returns, The Mark of Zorro, The Mummy's Hand, Murder Over New York, The Mysterious Dr. Satan, One Million B.C., Pinocchio, The Thief of Bagdad, Young Bill Hickok.
Notable Comic Books
Flash Comics #1 (first Flash and Hawkman), Whiz Comics #2 (first Captain Marvel), More Fun Comics #52 (first Spectre), Detective Comics #38 (first Robin), Action Comics #23 (first Lex Luthor), Batman #1 (first Joker, Catwoman), first The Spirit comic strips, All-American Comics #16 (first Green Lantern), Marvel Mystery Comics #9 (first meeting between two super-heroes (Human Torch and Sub-Mariner)), All-Star Comics #3 (first Justice Society of America).
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