Pennsylvania is as diverse a state as you'll find, with large metropolises flanked by mid-sized cities and rural small towns, all home to populations that are getting younger and more international.
But when it comes to tracking how we spend our money, the actual geographic flow of Pennsylvania's dollars splits the commonwealth right down the middle. Theoretical physicist Dirk Brockmann used data that tracked how our dollar bills travel and utilized network theory to replace state boundary lines with lines drawn to reflect where dollar bills are less likely to cross. The resulting map, published in a recent Fast Company story, shows that often those re-drawn lines mimic state borders, but many do not.