A Chin Up (IMAGE) University of Iowa Caption Notice how the modern skull, on the left, has a point at the bottom of the face compared to the Neandethal-era skull on the right. The reason: Only modern humans have chins. Credit Tim Schoon, University of Iowa 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.