3.2 Million-Year-old Foot Arch (IMAGE) University of Missouri-Columbia Caption University of Missouri and Arizona State University researchers have found a bone that indicates human ancestors had arches in their feet, a major evolutionary shift for "Lucy" and her species. Credit Elizabeth Harmon 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.