What gas filled the Hindenburg airship?

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What British actor founded the London Centre for Stammering Children?

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What children's classic first chapter is titled "Mowgli's Brothers"?

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What do sisters Elinor and Marianne Dashwood represent in the title of a Jane Austen novel?

What is the capital of the US state of Pennsylvania?

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Anthracite and bituminous are two types of what mineral?

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At what theatre was Abraham Lincoln shot?

What is short for "light amplification by stimulated emission of radiation"?