Which instrument does the Leader of an orchestra play?

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How many strings does the common Bass guitar have?

Which famed Science fiction author wrote the novelization for the 1966 film, "Fantastic Voyage"?

The Sonoran Desert is located in California and which other state?

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What is a group of Vipers called?

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In ancient Rome what was the "Tabularium"?

Tin is primarily obtained from which ore?