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What Is a Palindrome?
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What Is a Hurricane?
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What Is a Sonnet?
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What Is a Hippie?
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What Is a Narwhal?
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What Is a Smokejumper?
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What Is a Multiple?
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What Is a Chinchilla?
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What Is a Limerick?
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What Is a Cannonball?
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What Is a Sinkhole?
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What Makes a Pyramid?
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What Is a Raptor?
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What Is a Chuckwagon?
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What Is a Parasite?
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Can a Human Outrun a Cheetah?
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What Is a Waterspout?
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What Is a Supernova?
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What Is a Zamboni®?
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What Is a Milestone?