Ключевые слова: 20s, 30s, casual, caucasian, class, classroom, college, communication, computer, concentration, desk, desktop, education, equipment, explaining, female, finger, focused, hand, indoors, information, internet, job, keyboard, learn, learning, line, male, man, mid adult, monitor, office, pc, pointing, row, screen, showing, sitting, student, students, study, studying, teacher, teaching, technology, typing, university, using, woman, young adult,