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
What was published in Japanese newspapers every month from December 1941 to September 1945?
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What was La Casa Pacifica?
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King Edward VIII gave up the throne in 1936 in order to do what?
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What was the name of the war between Sparta and Athens?
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The study of the past is called?
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In what year did France and Britain declare war on Germany?
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Who did the Emancipation Edict, issued by Czar Alexander II, free?
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What happened in Britain in 1666?
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