Ключевые слова: biotechnology, bottles, boy, chemical reaction, chemical reagents, chemistry lesson, children, classmates, classroom, communication, education, elements table, experiment, friends, girl, happy, hugs, igen, intelligence, investigation, laboratory glassware, lesson, liquid, looking at camera, participation, pipette, positive, pupil, school, school age, science, smart school, smile, special, standing, study, team, test tube, waist up, water,