The former director of UNESCO Institute of Education in Germany, Prof Dave spoke at length on trends in teacher education in the context of the 21st century last week at the Gujarat University. Teachers today have an opportunity to start a golden age in the 21st century, he told the audience comprising mainly of teachers and teacher-students from Gujarat University and Gujarat Vidyapeeth. Prof Dave said it was important that the teachers learn to unlearn a concept purported in the Indian system. Learning and unlearning should go hand in hand, he said.