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What Was the Trail of Tears?
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What Is a Spit Valve?
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Who Is Uncle Sam?
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What Is a Flash Mob?
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Who Was Marie Maynard Daly?
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What Types of Things Can You Recycle?
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Who Invented Social Media?
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Is There Such a Thing as Love at First Sight?
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How Long Is a Marathon?
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How Do Mood Rings Work?
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Who Invented Playdough?
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Who Was Kalpana Chawla?
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How Is a $1 Bill Made?
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What Does "Top Secret" Mean?
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Who Jumps the Highest?
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What Is a Blobfish?
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What Was the Neo-Babylonian Empire?
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Who Was Mister Rogers?
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Who Was Guy Fawkes?
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Who Is Michael Jordan?