Hamed Sanei, Steve Grasby and Benoit Beauchamp, University of Calgary (image) University of Calgary Share Print E-Mail Caption Dr. Hamed Sanei (right), Steve Grasby (center) and Dr. Benoit Beauchamp (left) discovered another key player assisting in Earth's greatest extinction: mercury. Dr. Benoit Beauchamp (left) is a professor at the University of Calgary. Dr. Hamed Sanei (right) and Steve Grasby (center) are research scientists at Natural Resources Canada and adjunct professors at the University of Calgary. Credit University of Calgary, Riley Brandt Usage Restrictions Please use credit. Share Print E-Mail 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.