We are not, and never have been, visited by extraterrestrial aliens. If, and that's a huge IF, they had the vast technology to travel interstellar space, they 1) wouldn't play hide-and-seek games, 2) be inept enough to get "caught", and 3) with the thousands of "sightings" by everyone's brother, cousin, and uncle, not ONE verified, substantiated evidence has been presented (except the government... really ??? ) . Nope, there ain't no Clark Kent, and the vulcans are still on the planet vulcan. It's fun to think so, after all... I'm a Klingon !