Ключевые слова: analysis, background, biology, black, blackboard, board, chalk, chalkboard, chemical, chemistry, classroom, college, different, drawn, educate, education, exam, handwriting, intelligence, knowledge, learn, learning, lecture, lesson, lifestyle, molecular, object, pictures, reaction, research, school, schooling, science, scientific, sign, solution, stud, student, study, studying, symbol, teach, teacher, teaching, training, university, white, wooden, word, written,