Rebecca Shellock (IMAGE) Australian National University Caption Dr Rebecca Shellock. Image: Tracey Nearmy / The Australian National University. Credit Tracey Nearmy / The Australian National University Usage Restrictions Credit to Tracey Nearmy / The Australian National University 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.