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The Unexplained Files is a 2010s American documentary TV series, airing on Science, which investigates Paranormal and other unexplained phenomena.
This was the highest-rated series on Science during its first season in 2013.
If ancient aliens and UFOs seem like crackpot theories to you, just remember that astronomers estimate there are 100 billion (with a "b") Earth-like habitable planets in the Milky Way.