Artificial intelligence boosts homework scores but cuts exam results by 20 per cent, and this “brain drain” effect takes two years to fully emerge, a new study has found.Generative AI is rapidly transforming classrooms as much as workplaces, with students increasingly turning to chatbots to draft essays and solve problem sets. But is the technology a personalised tutor or a slow-acting cognitive poison?Research by scholars from Stockholm University and the University of Hong Kong, who tracked...