Ключевые слова: academic, beaker, boy, casual clothing, caucasian, checking, chemical, chemistry, child, childhood, class, classmates, classroom, cute, dna, early learning, education, elementary, elementary school, equipment, female, girl, happiness, holding, indoors, knowledge, laboratory, learn, learning, lesson, liquids, looking at camera, male, medical research, microscope, mixedrace, molecular structure, molecule, preschool, pupil, school, schoolboy, schoolchild, schoolchildren, schoolgirl, scientific experiment, smiling, standing, studying, technology, test tubes,