Architected design for tougher cement (IMAGE) Princeton University, Engineering School Caption The architecture resists crack propagation and toughens the material. Credit Sameer A. Khan/Fotobuddy Usage Restrictions non-commercial use 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.