Do-it-yourself measurement (IMAGE) American Institute of Physics Caption Do-it-yourself measurement. A student took a single photo (left) of a carbopol suspension in water scooped with a small spatula. The physics of this flowable gel substance, similar to hair gel, was mathematically modeled to estimate the yield stress. Credit M. Tanver Hossain and Randy H. Ewoldt Usage Restrictions Journalists may use this image only with appropriate credit. 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.