fossil bones with cut marks (IMAGE) George Washington University Caption 1.5 million year old fossil bones with cut marks from Koobi Fora, Kenya Credit Briana Pobiner Usage Restrictions With permission from GW 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.