Ключевые слова: albert, atomic, billboard, black, black board, blackboard, board, chalk, chalkboard, class, classroom, college, concept, drawing, e, education, einstein, emc, emc2, energy, equation, formula, green, handwriting, high school, intelligence, learning, lesson, mass, mass energy, matter, message, physicist, physics, school, science, showing, sign, student, studying, symbol, teach, teacher, text, texture, theory, university, writing,