Crack Propagation in a Silicon Wafer (IMAGE) International Union of Crystallography Caption On the left are the direct transmission images. On the right are the diffraction images. Credit Rack et al. Usage Restrictions None 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.