Carl might be on his way to the Big Pudding Can in the Sky
In the Season 1 finale, Julia becomes a hostage of a Mexican drug kingpin who says he'll release her only if she produces an interview that's favorable to him.
Virus hunters in South Africa descend into the Grootboom Cave to search for disease-carrying bats.
Astronaut Scott Kelly's year in space is examined and the impact it had on him mentally and physically.
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