Alexander Stewart, University of Houston (IMAGE) University of Houston Caption Alexander Stewart, a mathematical biologist at the University of Houston, says subtle differences in the way social networks are formed can have a major impact on political decision-making. Credit University of Houston Usage Restrictions None 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.