Everytime after sun goes home we say "hi" to something called lamp which gives us light. It is very simple to use. Just connect it to electricity resource and it will give you a light. But we don't know how much time did it take to developed as lamp. It took almost 80 years for light bulbs to be developed as now we see.
We just do not know who evolved in this work. Actually we don't.
And when we talk about our greatly known ancestor Genghis Khan we don't talk about his generals, queens, father those are background the background to that wonderful hero born. About democracy, we talk like communism was kind of evil so we don't have to remember it.
Time really forgets some things.
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