I'm always a huge fan of the impending heat death of the universe
kind of stories. Something about it just makes my day-to-day hum-drum of a job seem a lot more bearable knowing that all my work really means nothing
"The Last Question" by Asimov in particular is one of my favorites.
Of course, they often tend to be a bit of a downer, don't they? All that 'no more matter' thing can really bum a reader out if they dwell on it too long. I really appreciated the effort taken to actively turn the tone in this story from "impending doom" into a slightly more optimistic story of nascence, growth, and life (in whatever form) continuing on.
If I were to nitpick, the staunch by-the-books nature of my brain at first kind of scoffed at the notion of self-aware complexity emerging from the meager barely-detectable foam of Hawking radiation... but hey, if you throw egregiously large amounts of time at a thing, even I'm conducive to saying "what the hay" and getting on board.
Still wet behind the gears.