Sun Lee ’09, second from left, poses with classmates as they embark on their journey up the Madre de Dios River, a tributary to the Amazon which runs through the Madre de Dios region of southeastern Peru, bordering Brazil and Bolivia. The expedition is part of an introductory science course, Rainforest Expedition and Laboratory, taught by Scott Strobel, HHMI professor and chair of molecular biophysics and biochemistry at Yale.