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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 All the Planets Doubled in Size?

    What If All the Planets Doubled in Size?

    36
  4. What If You Drank Radioactive Tritium?

    What If You Drank Radioactive Tritium?

    11
  5. What If Latin America Was a Single Country?

    What If Latin America Was a Single Country?

    5
  6. What If We Destroyed a Black Hole?

    What If We Destroyed a Black Hole?

    16
  7. What If We Entered a New Ice Age?

    What If We Entered a New Ice Age?

    18