In 1598: King Henry IV of France signed the Edict of Nantes, granting rights to the Protestant Huguenots.
In 1970: Apollo 13, four-fifths of the way to the moon, was crippled when a tank containing liquid oxygen burst. (The astronauts managed to return safely.)
In 1990: The Soviet Union accepted responsibility for the World War II murders of thousands of imprisoned Polish officers in the Katyn Forest, a massacre the Soviets had previously blamed on the Nazis.
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