The Science Tent (IMAGE) University of Arizona Caption Study co-authors Veronica Muiruri (left), Anthony Mbuthia (blue shirt) and Andrew Cohen label a freshly sealed sediment core sample from Lake Magadi, Kenya. Credit Anne Billingsley Usage Restrictions This visual may only be used in conjunction with reporting on or posting of this news release. Credit must be given as indicated. 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.