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I believe that a good sci-fi should be like a scientific research-work. It should be based on known grounds and should make viable predictions: science-fiction is "fiction" and not "fantasy" !
This book, "The End of Infinity", contains three short science-fiction stories and an essay.
These stories, I feel, confirm to my belief. The lead story "SETI", being my favourite. It has a speculation why there may be an end of infinity.
Isaac Asimov was a phenomenal prodigious unbeatable author. My salutations via "Foundation's Molecule" and "Let's get together".
The essay "Lucifer" is quite andragogical.
Though these are works of fiction, I emphasise that they address issues of paramount importance.