With what is sulfur and charcoal mixed to make gunpowder?

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What is known as a "Magnum Opus"?

Which bone is known as the Patella?

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What was wrong with the Grinch's heart in, How the Grinch Stole Christmas?

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What city is the setting for the TV series "Mad Men"?

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On what date did singer, songwriter and actor, David Bowie die