opalescent drop (IMAGE) Johannes Gutenberg Universitaet Mainz Caption An opalescent drop, several millimeters in diameter, under white light illumination. While there are a few individual reflections visible at the drop rim, the drop interior cannot be observed. Credit photo/©: Josefine von Puttkamer-Luerssen / JGU Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. No derivatives or adaptations of the work are permitted. License CC BY-NC-ND 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.