Ideal for confident learners of English looking to improve or consolidate their English. The book is filled with useful vocabulary that is carefully graded to level, it also comes with audio, so that you can listen to the story at the same time as reading.A human being is a soft, weak creature. It needs constant supplies of air, water and food; it has to spend a third of its life asleep, and it can't work if the temperature is too hot or 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 stronger, more efficient - and sometimes more human than human beings. Isaac Asimov was one of the greatest science-fiction writers, and these short stories give us an unforgettable and terrifying vision of the future.