James Tour, Rice University (IMAGE) Rice University Caption Rice University chemist James Tour holds coal and a vial of coal-derived graphene quantum dots. The dots have been modified for use as an effective antioxidant. Credit Jeff Fitlow/Rice University Usage Restrictions Credit must be used. 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.