John,

they used dataset from 51 worldwide distributed populations and used graph theory to find the shortest path (starting in Ethiopia) using land connections whenever possible and making use of natural obstacles to deflect a path.

The migration routes generated this way were quite close to those of Cavalli-Sforza. Genetic diversity between population correlated highly with path distance from Ethiopia.

I actually kind of doubt...
The 'actually' is brilliant, Little Hawk. It makes you look so special when saying something that is trivially true.

Wolfgang