What are the six most abundant Greenhouse Gases?

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The Hall of Mirrors is the largest room in what famous structure?

What river forms much of the border between Washington and Oregon?

What is the capital of Belgium?

What was the Republic of Nauru previously known as?

What color is a polar bear's skin?

What is the largest gland in the human body?

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What TV spy often tried to pass himself off as a salesman for the Pontiac Greeting Card Company?

What Welsh songstress has performed the themes for three different Bond movies?

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Tribology is the study of what?