Ключевые слова: academic, blackboard, board, chalkboard, chemical, chemist, chemistry, class, classroom, demonstrating, discovery, discussing, doctor, education, experiment, experimenting, explaining, fluid, glass, learning, lecture, lecturer, lesson, liquid, looking, man, mentor, mentoring, old, presenting, research, researcher, sample, school, science, scientific, scientist, showing, solution, study, studying, substance, teacher, teaching, test, testing, tube, tubing, tutor, tutoring,