Author Jennifer Raff (IMAGE) University of Kansas Caption Jennifer Raff of the University of Kansas, has written a new book for popular audiences combining archaeology with emerging genetic evidence to tell the story of peoples from Siberia who were the first to populate the Americas some 20,000 years ago. Credit Twelve Books Usage Restrictions None. 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.