* [Spaced Repetition Systems Have Gotten Way Better](https://domenic.me/fsrs/) ^[HN](https://news.ycombinator.com/item?id=44020591)^
This is mostly about [FSRS], which is a much improvement scheduling algorithm.
* [Andy's Notes: Spaced repetition memory system](https://notes.andymatuschak.org/Spaced_repetition_memory_system) ^[HN](https://news.ycombinator.com/item?id=44022225)^