Feeling chemistry (IMAGE) University of Delaware Caption Research by the University of Delaware has shown that humans can feel tiny differences in a surface, down to the substitution of a single atom. Credit Courtesy of Charles Dhong Usage Restrictions None 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.