Ключевые слова: 20s, adult, african ethnicity, answering, asian ethnicity, attention, back view, black, boys, caucasian, chalkboard, childhood, children, classroom, copy space, day, education, elementary school, girls, horizontal, indoors, interest, kids, knowledge, learning, lesson, medium group of people, millennials, mixed race person, multiethnic group, preteens, primary school, profession, pupils, question, raising hands, school, school kids, schoolboys, schoolchildren, schoolgirls, selective focus, sitting, south africa, teacher, teaching, volunteering, waist up, woman, young adult,