May for teachers is a bitter-sweet time of year. We are anxiously awaiting the end of the school year so that we can get started with summer. We are also saying goodbye to a group of students who have been with us for nine or so months. Students who have grown academically (we dearly hope), physically, and emotionally (again, we dearly hope). In my early years of teaching, I would write a year-end letter that I would give to my students on their last day with me. As technology progressed, my year-end letter became a DVD slide show set to music. The last few years a…