The Travelling Politician Problem: what's the shortest route between marginals?http://www.theguardian.com/science/alexs-adventures-in-numberland/2015/apr/21/the-travelling-politician-problem-heres-the-shortest-route-between-the-50-top-marginals by TuxMulder • 11 years ago 1 0 11 years agoTHtheguardian.com