Twice within the last few days, someone that I was conversing with from the Transhumanist community mentioned a far future technology that I had originally learned about from the Bobiverse science fiction book series by Dennis E. Taylor. The two technologies recently discussed were O'Neill cylinders and von Neumann probes. This hard science fiction series introduces readers to many more future technologies in an accessible and entertaining manner including a couple of my favorites, cryonics and uploading.
I have recommended this series to my friends in the Church of Perpetual Life multiple times as it frequently relates to topics discussed in our Zoom parties before and after the main service. Although not part of the Bobiverse series, I am looking forward to listening to the author's latest book, Flybot, available in audio format from Audible.