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Dec 12, 1901: Marconi Sends First Atlantic Wireless Transmission

Italian physicist and radio pioneer Guglielmo Marconi succeeds in sending the first radio transmission across the Atlantic Ocean, disproving detractors who told him that the curvature of the earth would limit transmission to 200 miles or less. The message–simply the

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Dec 12, 1913: Mona Lisa Recovered in Florence

Two years after it was stolen from the Louvre Museum in Paris, Leonardo da Vinci’s masterpiece The Mona Lisa is recovered inside Italian waiter Vincenzo Peruggia’s hotel room in Florence. Peruggia had previously worked at the Louvre and had participated

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Dec 12, 1787: Pennsylvania Ratifies the Constitution

On this day in 1787, Pennsylvania becomes the second state to ratify the Constitution, by a vote of 46 to 23. Pennsylvania was the first large state to ratify, as well as the first state to endure a serious Anti-Federalist

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Dec 12, 1980: Da Vinci Notebook Sells for Over 5 Million

On this day in 1980, American oil tycoon Armand Hammer pays $5,126,000 at auction for a notebook containing writings by the legendary artist Leonardo da Vinci. The manuscript, written around 1508, was one of some 30 similar books da Vinci

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