In particular, spaced repetition software with judicious use of machine learning on the backend. Technically this breaks the rule of “Same level of technology as today
I’m pretty sure this definitely exists today in apps like Duolingo and Khan Academy, at the very least the originator of spaced repetition wrote an article about it in 1998: https://www.supermemo.com/en/archives1990-2015/english/ol/nn_train
I’m pretty sure this definitely exists today in apps like Duolingo and Khan Academy, at the very least the originator of spaced repetition wrote an article about it in 1998: https://www.supermemo.com/en/archives1990-2015/english/ol/nn_train