Marks Produced by Humans (IMAGE) University of the Basque Country Caption Image showing marks produced by humans when eating meat in the experiment carried out in this research. Credit Antonio J. Romero / UPV/EHU Usage Restrictions None 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.