Check out this video called Human Family Reunion. It covers what I tend to refer to as genealogical math -- the fact that we have 2 parents, 4 grandparents, etc. . . . and how quickly that explodes to millions. Also explains that our ancestral past is more of a diamond shape than a pyramid as we tend to think. And of course, it addresses one of my favorite topics -- kissing cousins!
While there are no startling revelations for hard-core genies in this video, it's very well done, and I really enjoyed it. Does a nice job of summing up a lot of info in just a few minutes. All in all, definitely worth the investment of a few minutes to watch.
Just one little quibble -- he keeps saying "most common recent ancestor" (MCRA) instead of "most recent common ancestor" (MRCA). If you take a moment to ponder that, there's a world of difference!