why cant humans really live peacefully?

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science has advanced terribly that it has taught man how to fly high in the sky like the birds and how to dive into the depths of the sea like the fish. leave alone all other things science has taught or made possible for man. but its sad that science could not teach humans to live peacefully and friendly? in most parts of the world theres only war killing innocent people only just because of the so called great inventions of the great science. how can the whole world live peacefully. what really can need to be done to change the world so that all humans live peacefully and friendly?