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History and geography

You can learn from history and read about geography and history of the world. The history of Rome, Europe, America, Asia.


Neon lights and lamps

French chemist Georges Claude invented in Paris sustavrasvjete using light pipes, in fact the first neon lamp

French chemist Georges Claude invented uParizu lighting system using light-pipe zapravoprvu neon lamp. Claude is put into an electric charge hermetičkizatvorenu tube with neon gas and got a long, penetrating light, ideal for advertising purposes. < when they passed ispredjedne distant stars. In a study using a new tehnikapoznata as gravitational microlensing, which allows sesvjetlost distant cosmic objects and enhance up to 500 times. |

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