Holy Emperor Louis IV of Bavaria defeated Frederick I of Austria during the Battle of Gammelsdorf.
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The Berlin Wall began to fall.
Facebook's parent company, Meta, laid off 11,000 employees amid a weak advertising market.
NASA launched the Apollo 4 test spacecraft to test the Saturn V rocket for the first time.
The European Space Agency launched the Venus Express, the first European spacecraft to reach Venus.
Mary Jane Kelly was found dead on her bed in London. She is thought to have been the fifth and final victim of the infamous serial killer, Jack the Ripper.
