The Principle of Space Repetition

Space repetition is a psychological principle that was pioneered by a german psychologist named hermon ebing haus. He found that you reinforce this information by being exposed to it over a period of time, your brain remembers it for longer and longer on each exposure. So if i am trying to learn the author of a book, and i make a flash card on it, i will see that flash card twice in the first day that i'm learning it. Then i'll see it again the next day, and then I'll see it another two days later. And eventually, like i have cards that i'm not going to see again for about six years.