The results of their research are a new set of models for handling the movement of viruses - based on simple scaling laws.
Hufnagel said that the group's findings were surprising because the bills moved along a simple mathematical model, called universal scaling laws. In this case, scaling laws describe movement from local areas to regional to long-distance lengths, but they have been applied to biology and physical systems.Fascinating stuff, and all from what began life as a simple idea.
Using data from half a million bills tracked on the site, the scientists developed a scaling law theory that describes the observed movements of travellers over distances from just a few kilometers to a few thousand. For example, most money travels locally, but there is a small likelihood it will move across the country.
rowanf'll certainly find this interesting...