Ali lives in a tall building in the city. At night, many lights shine from the windows, and cars move quickly on the roads below., , Ali learned about inventions at school. His teacher said a scientist thinks carefully and tries many times before making something new., , When the lights suddenly go off, the room becomes dark and silent. A few moments later, the electricity comes back, , Before sleeping, Ali looks at his phone and turns off the light bulb., , Ali thinks about how different his evening would be without inventions., .

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