human migration

Modern world migration (past 20 years),
from Wittgenstein Centre for Demography and Global Human Capital.

Historic human migration from: 

http://freepages.genealogy.rootsweb.ancestry.com/~ncscotts/Y-DNA/Migration%20Maps/Y-Migration_Map.jpg




Pros & Cons of genetic testing: http://www.utexas.edu/features/2007/ancestry/