Instruct: Classify a review into positive or negative sentiment.
Query: Classic SCIENCE fiction

If you like science fiction with an emphasis on science, this series about a galaxy whose development is dominated by the development of antigravity and anti-agathics (drugs that stop both illness and the aging process) will delight you. Its great example of cold war era science fiction. Don't look for sophistication in writing or character development, or the kind of dark but hip view of the future you might get from a William Gibson; this is fiction more in the Asimov tradition -- a little more serious, better written than the Foundation Trilogy, but it feels like that kind of read.