Prehistoric Food Globalization GIF (image) Washington University in St. Louis Share Print E-Mail Caption Animation illustrates how four of the ancient world's most important domesticated grain crops spread across the Old World between 7,000 and 3,500 years ago. https://media.giphy.com/media/5YhLYT0OTG11uiY648/giphy.gif Credit Data source: Xinyi Liu; Animation by Javier Ventura/Washington University in St. Louis. 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.