Ключевые слова: analysis, beaker, biology, biotechnology, boy, caucasian, chemical, chemistry, class, classroom, closeup, cognition, concentration, discovery, education, elementary, experiment, experiments, horizontal, indoor, innovative, kid, knowledge, laboratory, lac, learn, learning, lesson, liquid, looking, male, medicine, microscope, one person, person, research, sample, school, science, scientist, smart, student, students, study, studying, test, tube, working,