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bulb
Autor: watcha_macallit
Źródło: http://www.flickr.com
Lightning is a sphere many of us have great associations with. It is indicated by the fact that, above all, owing to having some lights in our house we can for example more appropriately deal with the darkness and work longer even if it’s dark outside. Presumably this is one of the most important inventions that has been created in last millennium, as owing to it people gathered an occasion to work longer.