Ключевые слова: absorbed, academic, attentive, audience, authority, beard, casual, classroom, confident, curly, education, educator, elder, engagement, expert, focused, glasses, guidance, hair, human, indoor, intellectual, knowledge, leadership, learning, lecture, listening, male, mathematician, mature, observant, participation, person, presentation, professional, professor, seminar, session, smart, standing, teaching, university, wisdom, workshop,