Ключевые слова: abstract, business, challenge, clock, concepts, countdown, eco, ecofriendly, ecological, ecology, ecosystem, effect, energy, environment, environmental, equipment, flow, flowing, global, globe, hands, hanging, hour, hourglass, ideas, instrument, isolated, measurement, minute, moving, newton, newtons cradle, passing, past, process, real, retro, series, speed, stopwatch, string, swinging, time, time cradle, timer, trickle, vintage, waiting, watch,