Willpower Experiment (image) Technical University of Munich (TUM) Share Print E-Mail Caption No laughing! This image shows an experiment to test willpower. Credit P. Groepel/TUM Usage Restrictions Free for use for coverage on Technische Universität München with copyright noted 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.