The name “Euro” was officially adopted for European Currency.
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'Jingle Bells' became the first song played in space when it was broadcast during NASA's Gemini 6 space flight.
The US State Department increased the reward for information on the Islamic State leader Abu Bakr al-Baghdadi to $25 million.
The Great White Fleet began its worldwide navigation.
German armies took Allied forces by surprise in the Ardennes, marking the beginning of the Battle of the Bulge.
Vasco da Gama became the first European to sail along Africa's East Coast.
