Why is HN so interested in linear algebra lately?
One topic gets voted to front page, then people fall down the rabbit hole, posting any links they hit on their way down.
Once every 6 months or so Plan 9 gets a front page hit, probably from someone getting into Go-lang. Then we see all the related papers and websites flood in for a while - Russ Cox' site, cat-v, Rob Pike Interviews, Utah2000, The birth of UTF-8.
It's like the September that Never Ended.
The Story of Mel is on the same cycle.