The guest speaker will be Cornell College Professor of Chemistry Cindy Strong. The chemical composition of fragments of pottery can help determine whether or not the fragments were produced from a common clay source. Using X-ray fluorescence spectrometry, Strong studied a set of pottery fragments from the Mill Creek culture in western Iowa that date to 1100-1250 AD. Working with archaeologists at the Office of the State Archaeologist at the University of Iowa, chemical and archaeological information can be combined to better understand the origin of the pottery fragments and the extent of trade between the Mill Creek people and other cultures. This lecture is presented by the Coe Chemistry and Anthropology programs.