Ключевые слова: 67 years, academic, attentive, bench, boy, boys, chemistry, child, childhood, concentration, desk, development, education, elementary, focused, holding, indoors, information, innocence, intelligence, intelligent, knowledge, lab, lab coat, laboratory, learning, lifestyle, male, mixedrace, mixedrace person, noting, one person, paper, pen, protection, safety, school, school kid, schoolboy, science, sitting, spectacle, student, study, studying, wearing, whiteboard, wisdom, writing,