The Exploratorium Teacher Institute (TI) has been the professional development home for middle school and high school math and science teachers since 1984. TI’s mission is to create and support a collaborative community of teachers, at all levels of their careers, through professional development that joyfully emphasizes the teaching and learning of science as a process for understanding the world around us. Each year, more than a thousand teachers attend TI workshops and programs designed to provide opportunities for them to ask questions as learners, share expertise as practitioners, and develop as leaders