Measuring the Toughness of the Material Chocolate (2 of 2) (image) University of Sheffield Share Print E-Mail Caption First year undergraduate engineering students take part in 'Danger Lab.' Credit The University of Sheffield Usage Restrictions Only use to accompany this article and credit The University of Sheffield. Share Print E-Mail 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.