Lamp change the world by allowing humans can conduct operations at night. According to historians, among those who have managed to create the incandescent lamps of the 1800s, Thomas Edison is recognized as the inventor because he created a perfect lighting system, including generator, wiring and bulb carbon fiber in 1879.
Since then, the model of human sleep slowly changing. Rather than go to bed when it started up (because hardly do anything in the dark) and continuous sleep until dawn, now it is only about 7 to 8 hours to sleep
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