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The principal thing that man must have in his life is family, because friends can be changed and can be unfaithful. Next thing is studies and work. Because this what will make his life easier to live.
Props are made to make human's life easier. they help him to ameliorate his every-day life, in many fields : Medicine, learning, teaching, beauty... But this must be the end. Human must be more creative and invent new props!