According to Francis Crick, human DNA was far too complex to have evolved over the history of planet earth, which led to theories of extraterrestrial interference with human DNA, in this clip from Season 17, "The Human Experiment." #AncientAliens Subscribe for more from Ancient Aliens and ...

Ancient Astronaut Theorists discover evidence of a writing system that would radically alter the timeline of human history, in this clip from Season 15, "The World Before Time." Watch all new episodes of Ancient Aliens, Fridays at 8/7c, and next day on The HISTORY Channel website at ...