What's the only Grand Slam tennis event still played on grass?

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For what game were two jokers originally included in a standard deck of playing cards?

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In what direction does the Nile River flow?

Moroni is the capital of which country?

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What is the capital of China?

Which astronomer gave his name to a telescope launched into space in 1990?

Who founded Microsoft with Bill Gates in 1975?

What disability does Dustin Hoffman's character have in the movie "Rain Man"?

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What year did Buddy Holly die in a plane crash?