Thanks for the ping. There was a GGG topic about the National Genographic, oops, Geographic article on an mtDNA study ($100 a head) in which one could participate. I didn't do that either. ;')
I've seen my own genealogy going back in some lines twelve generations, and have never encountered any crossed lines, so I'm inclined to think that I'm probably cousins with about half of America. :')
There was another topic on FR, I've been unable to find it, regarding a claim that everyone is descended from a single individual who lived in Asia a mere 3500 years ago, IOW, only that (he or) she was our last common ancestor. I wonder if anyone has the link? Good time to post the GGG links update.
I remember the article too but, you know me, I can't find anything.