Imagine a notebook selling for over $5 million. This is exactly what happened on December 12, 1980, when Armand Hammer paid this amount for Da Vinci's notebook. It was also on this day in 1913 when the Mona Lisa was returned after being stolen from an Italian nationalist two years prior. In 1901, on December 12th, the first radio transmissions were sent across the Atlantic, marking a milestone in communication. Perhaps the most infamous event that occurred on December 12, 2000, was the decision in the Supreme Court Case Bush v. Gore, in which the Supreme Court ordered the stoppage of the Floridian recount, thus making George W. Bush the President of the United States of America. Learn more of the significance of December 12 from this This Day in History video.