A Video Illustration of the Study (VIDEO) Ecole Polytechnique Fédérale de Lausanne 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 This is a video with a voiceover providing a visual description of the study. Credit F. Carbone/EPFL Usage Restrictions Media purposes only. Commercial usage restricted; by permission only. 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.