Exhaled material (VIDEO) Princeton University, Engineering School This video is under embargo. Please login to access this video. Caption To study the flow of exhaled material, researchers filmed the movement of a mist of tiny droplets illuminated by a laser sheet in front of a person speaking several different phrases adjacent to the sheet. Credit Princeton University Usage Restrictions non-commercial use 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.