Will robots replace humanity in due course of time...?

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Of late we hear the robots are doing many things which human beings are now doing.The scients are at research to improve the robots day in and dayout.They will not rest till the robots become almost human beings in all activities.We may not witness that time but it is going to happen one day in future.I begin to wonder whether robots will one day replace many of the human beings though not all.In such a situation what will be the role of human beings and whether humman beings will cease to exist in this world.What is your opinion..?