Microscopy (IMAGE) DOE/Sandia National Laboratories Caption Sandia National Laboratories researcher Ryan Schoell uses a specialized transmission electron microscope technique developed by Khalid Hattar, Dan Bufford and Chris Barr to study fatigue cracks at the nanoscale. Credit Craig Fritz, Sandia National Laboratories Usage Restrictions For news reporting purposes only. All other uses must receive express permission from Sandia National Laboratories. License Original 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.