Norm Networks (VIDEO) University of Pennsylvania This video is under embargo. Please login to access this video. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Caption A new study led by the University of Pennsylvania's Damon Centola provides a scientific explanation for how social conventions everything from acceptable baby names to standards of professional conduct can emerge suddenly, seemingly out of nowhere, with no external forces driving their creation. Credit Annenberg School of Communication/University of Pennsylvania Usage Restrictions In context of reporting 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.