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Why Do Catfish Have Whiskers?
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Where Is the 38th Parallel?
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What Causes Freckles?
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Why Do People Have Birthmarks?
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What Is Mercury?
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What Are Saturn’s Rings Made of?
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Where Does the Sand on Beaches Come From?
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Can a Strait Be Crooked?
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What Is the Space-Time Continuum?
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What’s the Difference Between a Crocodile and an Alligator?
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Will a Watermelon Grow in Your Belly if You Swallow a Seed?
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Who Was the First Female and American Indian Engineer?
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Why Do Pigs Like Mud?
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Who Is the Wisest Bird?
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Have You Ever Worn a Sombrero?
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What Is AIDS?
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What is a Ghost Ship?