No Earthly Explanation

“The evidence is very strong that Earth has been visited over many centuries by at least one, technically superior civilization.  Twentieth-century scholars continually uncover evidence that certain people of pre-historic times were taught a high degree of scientific information.  The instructors may have been an inter-stellar team of scientists whose assignment was to provide the necessary information so that civilization on Earth would get underway. The evidence that such information suddenly existed is very impressive and the aliens had to have exercised prehistoric man's intellectual powers beyond his natural abilities.”
"In-depth investigation of our origins to prove that all of us are a combination of earth and outer space beings."