Subscribe to Naked Science - http://goo.gl/wpc2Q1 Every other Wednesday we present a new video, so join us to see the truth laid bare... Just for a moment, imagine a universe awash with life, where we humans are not the only intelligent beings around. What might these alien races look like? ...

Ancient Astronaut Theorists believe there are hidden alien messages in Leonardo Da Vinci’s famous painting - The Mona Lisa. Discover more in this clip from Season 4, "The Da Vinci Conspiracy." Watch all new episodes of Ancient Aliens, returning soon, and stay up to date on all of your favorite ...