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  1. What If You Lived in the Stone Age?

    What If You Lived in the Stone Age?

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    18
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  2. What If South America and Africa Joined Together?

    What If South America and Africa Joined Together?

    2
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    48
    1
  3. What If You Drank Radioactive Tritium?

    What If You Drank Radioactive Tritium?

    11
  4. What If You Fell into a Yellowstone Hot Spring?

    What If You Fell into a Yellowstone Hot Spring?

    7
    1