> they study their subjects and work hard And spaced repetition is a very efficient way of doing that. Using cards for spaced repetition has always been commo

> they study their subjects and work hard And spaced repetition is a very efficient way of doing that. Using cards for spaced repetition has always been common between top students. I would not be surprised if brilliant people used it in one way or another. Modern spaced repetition apps are just the paperless equivalent.