Punching for Science (image) University of Utah Caption University of Utah medical student Michael H. Morgan strikes a punching bag that was used by Morgan and university biology Professor David Carrier in a study that suggests human hands evolved for fighting with fists, not just for the manual dexterity needed to use tools, play musical instruments and paint artworks. Credit Lee J. Siegel, University of Utah. Usage Restrictions None 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.