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Why Do Catfish Have Whiskers?
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Do Fish in Aquariums Swim in Freshwater or Saltwater?
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Where Is the 38th Parallel?
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What Is Mercury?
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Who Was the First Female and American Indian Engineer?
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Can a Strait Be Crooked?
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What Is the Space-Time Continuum?
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What Is the Oldest Species Living Today?
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What is a Ghost Ship?
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What Is AIDS?