I don't usually like stories that involve time travel. This one seems like a reaction to all of my objections–it addresses most of the inconsistencies of time travel in a clever plot. It is internally consistent, while most time travel stories are not. In its time, it is genius, but now it felt dated. If you can place yourself in a time when computers were expected to be able to think, or if you love Asimov, this book is for you. While it is a classic of science fiction, I didn't think it measured up to Heinlein. If I could go back in time, I would recommend it to myself, but in my top 100, not in my top 10.
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