**Notes/thanks/other declarations**

We want to express our sincere admiration and appreciation for all of the change agents—teachers, leaders, and caregivers alike—who work every day to ensure positive learning experiences in mathematics for children of all ages. There is no more complex work than the work of a teacher. We especially are grateful to those who welcomed us into their schools, classrooms, and families in an effort to grow and learn together as a community of math-minded enthusiasts.
