I roo am trying to curate my RSS feed to be doom-scrolling free. These largely achieve that for me. You'll find a smattering of political posts in them, but that's an inevitable side effect of living in abnormal political times.
https://scrollprize.org/ - The Vesuvius Challenge: Using high intensity X-ray scans and computation to attempt to retrieve lost scrolls from Pompei; real uplifting Sci-Fi stuff! Possibly the most heartwarming thing I know of on the internet; snatching ancient knowledge from the flames of history! What could be more poetic?
https://www.science.org/blogs/pipeline - In the Pipeline: The blog of Derek Lowe (pharmaceutical chemist), (in)famous for articles like "Sand Won't Save You This Time" Always interesting, though a lot of the chemistry goes way way over my head. Some political stuff lately, unavoidably given the current secretary of health.
https://blog.dshr.org/ - David Rostenthal: Digital preservationist.
https://www.jeffgeerling.com - Jeff Geerling: Raspberry Pi, Arm, digital radio, and other nerdery. I enjoy his videos, but I love that he does a plaintext version (first?) that's not just a transcript.
https://commandcenter.blogspot.com/ - Rob Pike: Programming luminary (Go, UTF-8, Unix, etc.)
https://fasterthanli.me - Faster than Lime: Amos's blog leaning heavily towards Rust. I'm a beginner in Rust, but I love this guy's style of writing even when the stuff he's writing about is beyond my current skill level.
Anyway, those are my go-tos at the moment. I look forward to trying a bunch of the others recommended here. Oh and I currently use Feeder under Android as my RSS reader; it's unexciting, which is what I look for in an app these days :D
A last recommendation - as part of trying to avoid doom-scrolling, I have a paper subscription to The Economist and I'm trying to train myself to read that instead of going to news sites. The lack of immediacy helps keep the emotional reaction in check (it's not as addictive of course).