Throughout history, many of the world's greatest thinkers have helped push civilization forward with their profound insights and extraordinary abilities. See more in Season 9, Episode 4, "The Genius Factor." Watch all new episodes Fridays 9/8c; Stream Next Day, and stay up to date on all of ...

Do stories from the ancient past hold evidence of alien overseers? See more in Season 9, Episode 3, "Aliens Among Us." Watch all new episodes Fridays 9/8c; Stream Next Day, and stay up to date on all of your favorite shows on The HISTORY Channel website at http://history.com/schedule. ...