Pendant Drop Experiment (IMAGE) University of Pennsylvania Caption Researchers created a 2-D liquid consisting of nanoparticles at the interface between a drop of oil and the surrounding water. By sucking the oil back into a pipette, they could infer some of the physical rules that govern this system. Credit University of Pennsylvania 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.