Guangjie Li and Jukka Vayrynen (IMAGE) Purdue University Caption Guangjie Li, graduate student, and Dr. Jukka Vayrynen, assistant professor of physics and astronomy, discuss calculations at the Purdue University Physics Building. Credit Purdue University Usage Restrictions None License Original 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.