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What Is Las Posadas?
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How Do Fangs Work?
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What Is the Birthday Paradox?
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Why Do Some Years Leap Ahead?
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Why Are There Seven Days in a Week?
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How Long Can Your Fingernails Grow?
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How Many Steps Does Chichén Itzá Have?
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What Are the New Seven Wonders of the World?
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Where Is Hoover Dam?
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What Is Area 51?
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What Is a Swallow?
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Why Are Some Tigers White?
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Where Are the Canary Islands?
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Who Was Evel Knievel?
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Who Invented Numbers?
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How Many Seconds Are In a Year?
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What Is the Giant Magellan Telescope?
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Who Are the Rockettes?
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Who Invented Time?
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What Is a Metaphor?