Complexity development of societies (IMAGE) PNAS Nexus Caption The authors shift each Natural Geographic Area’s (NGA) time series with respect to a single anchor time, so that all 23 NGAs can be visualized at once. The first principle component, denoted by SPC1 is a component with almost equal contributions from all nine complexity characteristics. Credit Tobias Wand and Daniel Hoyer Usage Restrictions None License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.