Three waves of migration (IMAGE) The Francis Crick Institute Caption Three waves of migrations across Europe were identified in the paper. Credit Leo Speidel, The Francis Crick Institute Usage Restrictions Only use with this story and with credits 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.