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Who Invented Rock and Roll?
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Where Is the Fastest Roller Coaster?
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What Is Fermat's Last Theorem?
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What Is Vocaloid?
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How Can You Pay It Forward?
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Can People Stick to Walls?
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How Did Astronauts Build a Space Station?
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What is Sky Surfing?
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What are the Highland Games?
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Who Is Misty Copeland?
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Who Is Serena Williams?
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Are Extreme Sports Dangerous?
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Who Were the Samurai?
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What Is Geocaching?
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What Is Autism?
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What Keeps Tunnels From Falling Down?
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How Does the Electoral College Work?
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Who Is Michael Jordan?
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What Are Prosthetics?
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Does the Olympic Flame Ever Go Out?