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  1. What If You Were Caught in a Riptide?

    What If You Were Caught in a Riptide?

    9
  2. Have Historians Discovered a Secret Civilization in the Amazon?

    Have Historians Discovered a Secret Civilization in the Amazon?

    20
  3. What If You Visited the Galaxy’s Most Dangerous Planet?

    What If You Visited the Galaxy’s Most Dangerous Planet?

    7
  4. What If All of Antarctica's Ice Suddenly Melted?

    What If All of Antarctica's Ice Suddenly Melted?

    44
  5. What If Earth Was a Pulsar Planet?

    What If Earth Was a Pulsar Planet?

    6