Ключевые слова: black, bright, bulb, choice, coins, concept, conservation, conserve, dark, eco, ecology, economical, efficiency, electric, electrician, electricity, energy, evolution, glass, glow, glowing, green, hardware, illumination, invention, lamp, led, light, metal, money, new, perpetual, plastic, power, progress, save, saving, science, shine, table, technology, view, white,