While I definitely appreciate the existence of pretty and accessible books like this, I wonder how effective spaced repetition is. If the end goal is testing the rate of retaining information then I definitely agree that spaced repetition is great.
However, my take is that people that have mastered subjects are the ones that can create stuff with that information so I believe the goal of "education" should be to graduate people to creators as soon as possible. Instead of flashcards why not graduate people to messing around with a quantum simulator. I'm not even sure how important memory is these days.
As far as I'm concerned some of the best educators out today are the Zachtronics and the Factorio devs. I hope more people follow in their footsteps.
quantum.country is actually a study in the effectiveness of spaced repetition. Andy and Michael have documented the results from Quantum Country here — https://numinous.productions/ttft/
Authors explain background and motivation for spaced repetition and mnemonic media in this extensive article. May be helpful if you're seriously getting into this.
Came in for the content, stayed for the article's format, which is quite something. Interactive, and using spaced repetition as a built-in. You can tell a lot of work has gone into this.
https://hackernews.hn/item?id=23561018