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