Did Fossil Lucy Walk, Climb or Both? (video) Dartmouth College Share Print E-Mail Loading video... Caption Anthropologist Nathaniel Dominy, Dartmouth College, questions the abruptness of our ancestral transition from the trees to the ground, more than 3.5 million years ago. Credit Dartmouth College Usage Restrictions None Share Print E-Mail 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.