Ключевые слова: academic, adult, background, beard, blogger, board, broadcast, business, caucasian, chalk, chalkboard, class, classroom, college, confident, contemporary, education, financial analyst, formal, formula, hipster, knowledge, learn, lecture, lesson, live, male, man, numbers, person, portrait, professor, remotely, school, science, scientist, smart, streamer, student, study, teach, to phone, trader, university, wave analysis, work, writing, young,