3 ms·
https://www.supermemo.com/en/blog/did-ebbinghaus-invent-spaced-repetition https://www.supermemo.com/en/blog/did-ebbinghaus-invent-spac...
by hevi_jos 8y ago
https://www.supermemo.com/en/blog/did-ebbinghaus-invent-spaced-repetition https://www.supermemo.com/en/blog/did-ebbinghaus-invent-spac...