ASU NanoSIMS with Maitrayee Bose and Christy Till (image) Arizona State University Share Print E-Mail Caption School of Earth and Space Exploration assistant professor Christy Till, right, and research assistant professor Maitrayee Bose, left, stand with the NanoSIMS. This advanced mass sprectrometer was a key ingredient in the discovery because it lets scientists examine the elemental and isotopic composition of microscopic samples smaller than a human hair's thickness. Credit Photo by Deanna Dent/ASUNow Usage Restrictions No restrictions when used in connection with reportage on this story. 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.