Mathieu Dumberry, University of Alberta (IMAGE) University of Alberta Caption Mathieu Dumberry from the University of Alberta is one of only a few people in the world investigating changes in Earth rotation. Credit John Ulan for the University of Alberta 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.