Dirk Brockmann Understand Quotations

The aim of our study was to be able to attach a number to human traveling behavior. If you want to understand how modern epidemics spread, you need to make some assumptions about how humans spread.

If you want to understand how disease spreads, you need to understand how humans travel, because a lot of the time humans carry the disease from one place to the next. It's clear people travel long distances less often, but make a lot of short trips, but what are the details? How often are trips of a certain distance made?