arrows (IMAGE) University of Technology Sydney Caption Why do some political systems become polarised? Credit Image: Pixabay Usage Restrictions Images and videos are released under the Pixabay License and may be used freely for almost any purpose - even commercially. Attribution is appreciated, but not required. License Licensed 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.