If you watch some of the channels like the discovery channel they have found old dwellings with oversized door with high step needed to get in them and "windows" higher than would benefit us normal folks. I am not saying that there are any left but it is a possibility that there were some isolated populations in ancient times. Don't know why none would have survived though. I would think that they would have a distinct advantage over us normal people.
First article is pretty interesting.I was on facebook the other week and found this article. Old history? This has an article on which kind of questions how long people have been around and provides evidence its a good article.