What is a system of circulating ocean currents referred to as?

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In Greek mythology, who did Hippomenes defeat in a footrace?

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Uriah Heep was a character in what Charles Dickens novel?

What is the highest mountain in Wales?

What language do natives call Farsi?

Which US states end with the letter "O"?

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What structure did the Chrysler Building surpass in 1929 as the tallest building in the world?

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Which composer wrote the classical piece "Messiah"?