Broken Human Hair (IMAGE) Cell Press Caption The image shows how protein fibers in the human hair cortex delaminate when the hair breaks, suggesting human hair fractures in a shear mode. Credit Wen Yang Usage Restrictions Credit required 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.