Durable Learning · Feb 2026
Spaced Repetition
Hermann Ebbinghaus discovered that we forget exponentially. Spaced
Repetition intercepts this curve by reviewing information at
expanding intervals, moving it from fragile working memory to durable long-term
storage.
01/The Core Mechanism
Exponential Decay
= Spaced Repetition: Increasing intervals
between reviews to maximize retention.
= Goal: Review just as you are about to
forget.
02/Key Variables
. Ease Factor: How quickly
intervals grow (item difficulty).
. Retention Threshold: Target
% of correct answers at review time.
! Cramming provides short-term gain but
guaranteed long-term loss.
03/The CLN Pipeline
Pre-chunked
CLN structure makes information review-ready by design:
+ Each
= line is an atomic Q/A
pair.+ Indentation provides mandatory context
without clutter.
* Active Test: What is the
optimal first interval? || 24
hours ||
04Tools & Algorithms
| Tool | Algorithm | Best For |
|---|---|---|
| Anki | SM-2 / FSRS | General Flashcards |
| SuperMemo | SM-18 | Research-grade SRS |
= CLN
is the source code; SRS is the
compiler for your brain.