Spaced Repetition
category
Spaced repetition is the practice of reviewing material at algorithmically increasing intervals — reviewing new information after 1 day, then 3 days, then 1 week, then 3 weeks — timed to occur just before the memory trace would naturally fade, exploiting the psychological spacing effect to maximize retention per unit of study time. Software implementations like Anki automate the scheduling entirely.
Role
The forgetting curve, identified by Ebbinghaus in 1885, shows that people forget approximately 70% of newly learned information within 24 hours without review. This is not a character flaw — it is human neurobiology. Spaced repetition is the only technique that systematically counteracts the forgetting curve, yet it is almost entirely absent from formal education systems globally. People who discover spaced repetition describe it as one of the most impactful intellectual tools they have ever encountered — and almost all of them describe discovering it accidentally, years after it could have changed their entire education.