Changing Flesh to Stone (IMAGE) DOE/Sandia National Laboratories Caption Sandia National Laboratories researchers Bryan Kaehr and Kristin Meyer analyze a silicized surface using optical microscopy and multiphoton fluorescence. Credit Randy Montoya, Sandia National Laboratories Usage Restrictions media only 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.