As people, we get around.
I think it was xoB who bought the package from I think it was National Geographic? where you could send them a cheek swab, and they could track back your Y chromosome and tell you where your distant ancestors had come from?
This really cool animation shows everything we know as a result of that Y chromosome, combined with archaeology, fossil records and climatology. Be sure to click on the little cloud symbol where it appears, and you'll get additional notes about climate change during that period. Don't miss the dramatic turn of events 74000 years ago!
http://www.bradshawfoundation.com/journey/?