Delfina Castellanos, Oaxacan Farmer (IMAGE) University of California - Santa Barbara Caption Oaxacan farmer Delfina Castellanos winnows black maize, a farmer variety she and her family grow. Credit Daniela Soleri Usage Restrictions None License Licensed 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.