Inside Cover, Soft Matter, 21 July 2020 (IMAGE) Lehigh University Caption Microrheological characterization of covalent adaptable hydrogel degradation in response to temporal pH changes that mimic the gastrointestinal tract, Nan Wu et al. An artistic rendering shows covalent adaptable hydrogel degradation in response to pH changes over time that mimic the gastrointestinal tract. The yellow dots represent the particles in the gel used to measure this process in microrheological experiments. Credit Courtesy of Soft Matter/Illustration by Sayo Studio LLC Usage Restrictions Credited, contextual use only 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.