Ключевые слова: back to school, back view, background, big, black, blackboard, blue, braid, chalk, chemical reaction, child, classroom, clever, concept, doodle, education, elementary, elementary school, equations, formula, girl, hand, head, holding, kid, learn, little, math, mathematical, mathematics, pensive, pigtail, rear viewpoint, school, schoolkids, smart, standing, striped, student, studio shot, study, symbol, t shirt, text, think, thoughtful, white, wisdom, writing, young,