Ключевые слова: blackboard, boy, chemical, chemistry, chemistry class, child, childhood, classroom, dark, desk, discovery, education, elementary school, equipment, experiment, expertise, girl, glasses, holding, humor, indoors, kid, lab coat, laboratory, laboratory glassware, learn, liquid, looking, open mouth, professor, research, school, school children, science, scientific solution, scientist, screaming, shocked, student, table, teacher, two people, wisdom,