What valuable product is obtained from the sturgeon?

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What is the Heart of Gold in "The Hitchhiker's Guide to the Galaxy"?

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In Greek mythology, what did the cyclops forge for Zeus?

Where is Gorky Park?

Who played Willis on the sitcom "Diff'rent Strokes"?

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What year did Jimmy Carter assume office as the 39th President of the United States?

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What is an Ishihara Test used for?