As artificial intelligence makes its way into schools, a paradox is emerging. Many educators, concerned about cheating and shortcuts, are trying to limit student use of A.I. At the same time, teachers are increasingly using A.I. tools themselves, both to save time on rote tasks and to outsource some of their most meaningful work, like grading essays and tutoring struggling students. That tension has prompted some difficult ethical questions. For example, is it fair to use A.I. to grade student