I read about this about two years ago but saw no follow up until now. Some group is trying to cover up our history. There is so much evidence of previous civilizations, a lot of it posted by you. Thanks. People keep sending me videos on the Tartarian Empire but I'm not sure about that. This reminds me to get the new Graham Hancock book that should be in paperback by now. It's about a pre-Columbian advanced civilization in what is now the US.