Ключевые слова: abstract, backdrop, background, banner, blackboard, blank, board, button, capability, chalk, chalkboard, circle, colorful, conservation, cosmos, design, education, emc, emc2, energy, equation, examination, formula, frame, icon, label, mass, pattern, physical, physics, quality, relatively, relativity, research, science, scientific, shiny, square, study, symbol, tag, texture, theory, universe,