Deborah Loewenberg Ball delivered one of the plenary addresses at the 13th International Congress on Mathematical Education in Hamburg, Germany on Saturday, July 30. Her talk, "Uncovering the Special Mathematical Work of Teaching," focused on the specialized set of instructional practices that are core to helping young people develop mathematical skills, ways of thinking, and identities, and supporting classrooms as equitable communities of practice. Slides from her address are available here and a video is available here.