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Bat expert Paul searches the deep caves of Kenya to catch and test bats that may be carrying an undiscovered virus that could cause the next pandemic.

Braving the wilderness of Canada, two scientists trek unforgiving terrain to uncover a secret, nuclear powered Soviet-era spy satellite that crashed there decades ago.

More than 30,000 people are currently missing in Mexico, and it’s become eerily commonplace for workers to stumble on mass graves in the countryside.