What name is shared by the rivers that run through Denison, Texas and Hanoi, Vietnam?

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Which of Dickens" novels is set during the Gordon Riots?

What US city is nicknamed the "Birthplace of the Nation"?

What is botany the study of?

Which viral disease did Louis Pasteur develop a vaccine for?

What pigment makes plants green?

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What slave name does Kunta Kinte's owner force him to adopt in Alex Haley's "Roots"?

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Who was the US president when the Dow Jones Industrial Average financially regained its pre-1929 peak?

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The Island of Bornhold is part of which European country?