Ключевые слова: 30s, 8 years old, african american, biology, black, boy, caucasian, chemistry, class, classroom, desk, education, elementary, encouraging, female, focus on foreground, fun, girl, group, happy, helping, horizontal, lesson, male, man, men, model, molecular, molecule, multicultural, people, person, physics, positive, primary, pupil, school, science, smiling, student, study, studying, teacher, thirties, together, tutor, woman, women, working,