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Top Secrets: Doomsday

Earth being destroyed from a gamma ray burst.
According to some doomsday theorists, we are running out of time. Scientists and conspiracy writers break down the 10 worst-case doomsday scenarios, as well as secrets to support each theory. History has proven that a catastrophic earthquake occurs about every 500 years and the next could happen any day. With low birth rates around the world, human extinction could be on the horizon. From a viral pandemic to a giant asteroid, this special explores how the world might end sooner than we think.