“If you worked for an hour at the average wage of 1800, you could buy yourself ten minutes of artificial light. With kerosene in 1880, the same hour of work would give you three hours of reading at night. Today, you can buy three hundred days of artificial light with an hour of wages. Something extraordinary obviously happened between the days of tallow candles or kerosene lamps and today’s illuminated wonderland. That something was the electric lightbulb.”