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

    What If All of Antarctica's Ice Suddenly Melted?

    46
  2. What If You Were Caught in a Riptide?

    What If You Were Caught in a Riptide?

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

    Have Historians Discovered a Secret Civilization in the Amazon?

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

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

    7