World History

What was added to the calendar on Dec. 31, 1990, to adjust for variations in the Earth's rotation?

More Questions from World History
At what age was Tony Blair elected Prime Minister of the United Kingdom?
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What do the words "Dalai Lama" mean?
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When was the Labour party formed in the U.K.?
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In what year was Harold of Wessex killed when he was struck by an arrow in the eye at the Battle of Hastings?
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What was the name of Mussolini's Yacht in World War II?
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What objects did the ancient Sumerians use to write?
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The Spanish holiday, National Day, celebrates whose arrival in America?
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Prime Minister Kim Campbell followed Margaret Thatcher as the only other woman to sit at what table?
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