Hopewell (IMAGE) University of Cincinnati Caption University of Cincinnati anthropology student Louis Herzner, bottom, and anthropology professor Kenneth Tankersley use a scanning electron microscope to study iron and silicon-rich microspherules collected at ancient Hopewell sites. Credit Larry Sandman 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.