The third annual Open Earth Systems summer short course in the Earth Sciences was held in Olin Hall over 10 days in early July. Participants were elementary, middle, and high school teachers and administrators from Baltimore City and County. Each earned three Professional Development credits during 40 hours of instruction and lab activities led by Linda Hinnov, Peter Olson, David Nelson, Darryn Waugh, Raj Goswami, Anand Gnanadesikan, and Ben Zaitchik. Topics included Earth History, Plate Tectonics and the Rock Cycle, Climate Change, and Natural Disasters. The OES summer short course is supported by a Frontiers in Earth System Dynamics grant from the National Science Foundation. Highlights included a cameo appearance by former EPS Professor Steven Stanley, and, thanks to Teresa and Kim, several delicious catered lunches.