Hi all, Do you think it's possible that some civilizations existed perhaps 5-10,000 years ago that had literacy, mathematics, philosophy, perhaps democracy and such? All those things that ancient Greece get a lot of credit for. I discussed this with my friend who responded that if they were that advanced they would also have had advance architecture which we would find evidence of today. But I think that would depend on the material they used to built with. Maybe that has all eroded over time. In other words, is it possible that we have had philosophers and scientists much greater than Plato and Aristotle who wrote about algebra, and perhaps even calculus, but we just haven't found the evidence?