When the obvious becomes radical fringe science it is safe to say your civilization isn't exactly roaring ahead in scientific advancement.
Jim Goad covers the basics here. It seems like rehashing ancient ground to me but I am sure some people will be hearing this stuff for the first time. I link to this article for their benefit.
P.S. Jim like all his generation gets it wrong when he assumes Cro-Magnons came out of Africa. They did no such thing. There are 14 haplogroups that signify African ancestry, the Cro-Magnon has none of them. Again, for those of you in back who may be hard of hearing, the Cro-Magnon according to DNA sequencing has none of the haplogroup markers for African ancestry. Zero. Zip. Nada. Nil. The Cro-Magnon appeared at the Southern tip of Europe as if he had been dropped from a helicopter in a crate that burst open when it hit the ground like the Nemesis Terminator from Resident Evil. Where the Cro-Magnon was before that, nobody knows because the evidence says he came out of nowhere. All we know is that he looks exactly like a Neanderthal that was stripped down and genetically reengineered to turn him into an unstoppable Neanderthal killing machine.