The word “teaching” is quietly changing. For generations, we measured a teacher’s effectiveness by delivery: how clearly lessons were explained, how fully the syllabus was covered, and how reliably students could reproduce content in examinations. In the AI age, that yardstick is losing relevance, not because teachers matter less, but because many functions once treated as the core of teaching are no longer scarce. Information is abundant. Explanations are available on demand. Practice can...

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