A human being is a soft, weak creature.It needs constant supplies of air,water,and food;it as to spend a third of its life asleep ,and it can't work if the temperature is too cold.
But a robot is made of strong metal. It uses electrical energy directly,never sleeps,and can work in any temperature.It is strong,mare efficient-and sometimes more human than human beings.
Isaac Asimov was one of the greatest science - fiction writer, and these short stories give us an unforgettable and terrifying vision of the future