The Royal We – by Steve Olson

Excerpt:

“Because people are always migrating from continent to continent, networks of descent quickly interconnect. This means that the most recent common ancestor of all six billion people on earth today probably lived just a couple of thousand years ago. And not long before that the majority of the people on the planet were the direct ancestors of everyone alive today.”

Full article may be found here:  http://bit.ly/gbiShb