“This is going to be my last year,” my English teacher told us as we finished our final. As a high school student, “last year” is a phrase I’ve heard over and over throughout the year. Teachers, from kindergarten to high school, seem more likely to leave than ever before. To our class, our English teacher leaving was a personal blow—she was one of the best teachers we’d ever had, and her leaving meant next year’s class was temporarily without a teacher.