Image 2 (IMAGE) Nanyang Technological University Caption A computational simulation at NTU showing how h-BN fractures. The material's intrinsic toughness arises from slight asymmetries in its atomic structure (left), which produce a permanent tendency for moving cracks to follow branched paths (right). Credit NTU Singapore Usage Restrictions NTU Singapore 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.