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Human nature  is basically a set of characteristics that everyone has in common. Except, how is human nature formed? By our cultures and the environmental factors that influence us when we come into this world. So can human nature be changed? Yes. no one is born with any knowledge of this world. It might be harder to change as your age increases, but it is definitely possible. All animals have to change in order to survive, if we had to change our nature in order to survive as a species, we should. Its only a matter if we want to change technology or our own brain.

I think its wrong to assume human brain does not change. Its just another learning/adjusting process.