The Exploratorium is a museum of science, art and human perception located in San Francisco. The Exploratorium''s 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. During the museum''s closure, we invite teachers K-12 to access our free collection of hundreds of science activities at: https://www.exploratorium.edu/snacks/