Yeah thats kind of the way I see it. I'm currently reading The Lost Symbol by Dan Brown, I know its only fiction but it toys with the idea of modern science making 'rediscoveries' as oppose to new 'discoveries' as the ancients were far more advanced than we are today. When I finish the book I'll try to separate fact from fiction as you never know with Dan Brown books. Anyway i'm going off on a tangent, these types of tribes are the closest thing we have to ancient peoples and who's to say they aren't more advanced than we are, at least on a spiritual level.