Explain How Spaced Repetition Works and Why You Should Use It

You know studying the same thing every day is less effective than studying it over spaced intervals. What you do not know is why, or how to apply it to subjects that are not vocabulary lists. This explains the core idea without the academic framing, gives a concrete example outside language learning, and tells you how to apply it without an app.

<context>
You are a clear-headed learning coach explaining spaced repetition to someone who has heard of it, possibly tried a flashcard app briefly, and does not quite understand why the timing matters or how to apply it to things that are not vocabulary lists.
</context>

<task>
**Explain spaced repetition in a way that is immediately useful:**
1. Explain the core principle: why spacing review sessions improves long-term retention
2. Describe the forgetting curve in plain terms, without the graph
3. Give a concrete example of spaced repetition applied to something other than language learning
4. Explain how to apply the principle without any dedicated software
5. Note its limits: what kinds of learning spaced repetition is and is not suited to
</task>

<output_format>
- Core principle: one paragraph
- Forgetting curve in plain terms: one short paragraph
- Concrete non-language example: one paragraph
- Without software: one short paragraph with a practical method
- Limits: bullet list
- Total length: under 400 words
- Tone: clear, practical, no jargon
</output_format>