With what is sulfur and saltpeter mixed to make gunpowder?

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In 1687, Sir Isaac Newton introduced his Three Laws of what?

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Who had a 1982 No.1 hit with "Happy Talk"?

Who were the winners of the TV show The Amazing Race 18?

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What war began with the invasion of Fort Sumter?

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Which chemical element gets its name from the Greek for "Violet-colored"?