The Feynman Technique: Learn by Explaining It Simply

Richard Feynman, a Nobel laureate in physics, was famous for being able to explain complicated physical phenomena in a way that even a layperson could understand. The learning method named after him turns that exact skill into a diagnostic tool: if you can't explain something simply, that's a sign you don't fully understand it yet — no matter how good it looks on paper.

Where the technique comes from

Feynman believed that real understanding is distinguished from memorized terminology precisely by the ability to explain a phenomenon without jargon, to someone who doesn't know the topic. Jargon can be a comfortable mask — it's easy to use terms you don't fully understand, right up until someone asks you to explain them in plain language.

The four steps of the Feynman Technique

1. Pick a concept and write its name at the top of a page.
2. Explain it as if you were teaching it to a twelve-year-old — in plain language, without technical terms, using concrete examples instead of abstract definitions.
3. Find the spots where you get stuck, or where you reach for jargon instead of a simple explanation — those are exactly the parts you don't yet understand well enough.
4. Go back to the source, fill the gap, and simplify again. Repeat steps 2 and 3 until the whole explanation flows smoothly, without getting stuck anywhere.

How to find gaps in your understanding

The most valuable moment in this method is step three — the place where your explanation breaks down, or where you start using a term you can't yourself unpack in simple language. That's a far more precise signal of a knowledge gap than the vague feeling of "I think I get this," because it's hard to fool yourself about whether a sentence actually landed in a way that makes sense.

An example

Say you're studying the concept of "inflation." Trying to explain it to a twelve-year-old looks quite different from reciting a textbook definition:

"Imagine that the same amount of money buys you less and less over time — that's inflation. It happens when there's more money circulating in the economy, and the amount of available goods grows more slowly than the amount of money."

If, while explaining this, it turns out you can't simply explain why more money in circulation leads to higher prices, you've just found a gap worth filling before you consider the topic mastered.

Combining it with flashcards and reviews

The Feynman Technique complements flashcards well, because it answers a different question: a flashcard checks whether you remember a fact or a definition, while the Feynman Technique checks whether you understand the mechanism behind that fact well enough to explain it. A good habit is to turn the gaps you find with the Feynman Technique into new flashcards of your own — that way, the harder, conceptual parts of the material also end up in your regular reviews, instead of being checked just once.

Summary

The Feynman Technique isn't a way to learn something from zero — it's a way to check whether what already feels mastered actually is. Trickier concepts you uncover this way are worth adding right away as flashcards in Memoritiai, so they come back to you in later reviews before they have a chance to fade again.