Scale Invariance (VIDEO) Duke University 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 Duke University researchers have shown how two chemical signals, a few variables, and a dependence on time can not only create patterns, but can also make sure these patterns have roughly the same proportions in every bacterial colony, and maybe even in every animal of a particular species. Credit Duke University 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.