World History

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

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What year did the Panama Canal open for shipping traffic?
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Which battle was fought on August 22, 1485?
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How many countries make up the World Trade Organization?
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The iconic speech, “I Have a Dream” was delivered by whom?
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What was added to the calendar on Dec. 31, 1990, to adjust for variations in the Earth's rotation?
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What is the time period before the Renaissance called?
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What did Syria legalize in 2001?
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Who was Henry VIII's last wife?
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