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Jason Martell and Tom Van Flandern lecture about Planet X, ancient astronauts at the 2008 Central Coast Science-UFO Symposium.

Join Jason Martell, regularly featured guest on the History Channel's "Ancient Aliens," as he shares years of research into the Ancient Astronaut...

Revisit the most compelling mysteries explored over the past 15 years of "Ancient Aliens." Experts like Giorgio Tsoukalos, David Childress, William...

We've all heard them ... the Mafia killed JFK, the government had a hand in 9/11 and the existence of aliens is the world's best-kept secret....