The End of Everything

The End of Everything by Katie Mack.

Quantum nihlism

This was pretty interesting! I'd heard of a few of these theories from random Reddit posts, but the book obviously goes into much more depth and provides some science to back the theories up. I've soured on pop-sci a bit since in hindsight most of the stuff I've read is either pushing the author's political agenda or just has a lot of stuff made up to be more interesting, but this neatly sidesteps the issue by being about stuff which won't happen for billions upon billions of years. Any present day effects are mostly left as an open-ended 'it helps us understand more about physics', other than the potential for the universe to suddenly end due to a bug (feels very familiar as a programmer). Worth a read for sure if you're interested in this kind of thing.