Problem: Jack Dorsey, Biz Stone and Evan Williams created what in 2006?
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A: twitter

Problem: What does the U.S. government famously store at Fort Knox?
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A: gold

Problem: Which UK group's fourth and final number one was 'Beat Surrender' in 1982?
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A: jam

Problem: Who plays the part Green Lantern in the 2011 film 'Green Lantern'?
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A:
ryan reynolds