Can AI replace teachers? Why human educators still matter

Imagine an ordinary classroom - except for one thing: the teacher standing before the class has never been a student herself. She has never sat nervously before an exam, worried about disappointing her parents, struggled with a difficult chapter late at night, or felt the joy of finally understanding something that once seemed impossible.

Her name is Sally, and she's an AI-powered humanoid robot developed by Toronto-based Realbotix. She was expected to help teach coding, robotics and AI at a high school in Salamanca, New York State. The plan has since been shelved after concerns over privacy and data collection. That pause may delay Sally, but it's unlikely to delay the future. AI, like it or not, is steadily entering classrooms.

The debate over Sally is, therefore, not about one robot. It's about an unexpectedly old question: what makes someone a teacher?


For centuries, the answer seemed too obvious to ask. A teacher doesn't simply teach a subject. Every teacher walks into the classroom, carrying an invisible schoolbag filled with old report cards, impossible homework, embarrassing mistakes, small victories and, if he or she is lucky, the memory of someone who once believed in them. Every teacher was once a child. Sally never was. Perhaps that absence matters more than all her computing power.

Curiously, Sally wouldn't have surprised Isaac Asimov. In his 1951 story, 'The Fun They Had,' children in 2157 learn from mechanical teachers that adjust lessons to each student's pace, a vision close to today's promise of personalised AI education.

The tech sounds remarkably modern. The question doesn't. Asimov quietly wondered whether something precious disappears when learning becomes a conversation with a machine instead of a room full of classmates. 70 years later, films like Park Joong Eun's 2021 After Yang continue to ask a similar question: can a machine become part of our emotional lives? Or does it merely imitate them?

None of this means AI should stay outside the school gate. Quite the opposite. Many countries and geographically remote areas struggle to recruit enough teachers, especially in S&T. Teachers spend hours on paperwork that nobody enters the profession ever dreamt about. If AI can take over routine tasks, explain algebra for the n-th time without sounding impatient, or help a shy student after school hours, it deserves a warm welcome.

The difficulty is that beneficial technologies never just solve problems. They quietly change . Calculators meant fewer logarithm tables. GPS meant fewer folded paper maps. Search engines meant fewer facts stored in our heads. AI will change classrooms too, perhaps in ways we cannot yet predict.

Some changes will be welcome. Some changes warrant reconsideration. For example, a human teacher forgets. A machine usually doesn't. A wrong answer, an awkward question, or an embarrassing classroom moment has traditionally faded with time. Should every childhood mistake become permanent data?

Yet, the deepest difference between a human teacher and a machine is unlikely to be intelligence. It's memory of another kind. Years after leaving school, few of us remember an elegant proof in geometry, or the date of an obscure historical treaty. We remember the teacher who waited after class because she knew we were struggling. We remember the teacher who looked at a disappointing marksheet and somehow saw more potential than the marks.

A machine may one day explain calculus more clearly than any teacher I ever had. I would happily welcome that day. But I still hope there's someone in the classroom who notices the student staring out of the window instead of at the board, or the one whose unusually untidy homework is really a quiet cry for help. Perhaps one day Sally will notice those things too.

Whether she truly understands them is a different question. Education has never been only about transferring knowledge. At its best, it's one human being helping another discover what he or she can become. It's about passing on confidence, curiosity, and hope. A human teacher gives a child something no algorithm can calculate: the feeling that another human being believes in them. And sometimes, that kind of lesson changes a life.