The Marquis de Lafayette became a major-general in the American Continental Army.
The first U.S. patent was issued to Samuel Hopkins of Vermont for a process of making fertilizer.
Mount Godwin-Austen (K2), the world's second-highest peak, was climbed for the first time, by an Italian team led by Ardito Desio.
The U.S. space probe Ranger 7 transmitted pictures of the Moon’s surface.
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