World History

Which Ancient Mexican civilization developed a symbol for "zero"?

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Where was the first UN summit on the environment, air pollution and global warming held, in 1992?
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Which civilization invented the first alphabet?
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What object, which debuted in 1949, is sometimes called a "45"?
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King Edward VIII gave up the throne in 1936 in order to do what?
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How old was Queen Anne, who reigned from 1702 until 1714, when she died?
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Which World War was the attack on Pearl Harbor a part of?
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Aside From Hiroshima, which Japanese city was also destroyed by an atomic bomb?
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According to the teachings of Buddha, what is nirvana?
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