The Feynman Technique: Learn Anything by Explaining It

Richard Feynman was a Nobel-winning physicist famous for making hard ideas feel obvious. His method for learning is deceptively simple: if you can't explain something in plain words, you haven't understood it yet. Here's how to use that to study.

The four steps

1. Pick a concept and write its name at the top of a blank page.
2. Explain it as if you're teaching a curious 12-year-old. Plain words, short sentences, no jargon you can't unpack. Use an example.
3. Find the gaps. The moment you stumble, hand-wave, or reach for a technical term to paper over a hole — stop. That's the thing you don't actually understand.
4. Go back to the source, fill the gap, and explain it again — until the whole thing flows in simple language.

That's it. The power is in step 3: explaining out loud makes hidden gaps impossible to hide.

Why it beats rereading

Rereading lets you recognise an explanation someone else wrote. Teaching forces you to generate one yourself — and generating is where understanding actually lives. You can nod along to a textbook paragraph on osmosis and still be unable to explain why a plant wilts. The Feynman technique catches that gap immediately, because you can't produce the explanation.

Understanding isn't the warm feeling that something makes sense. It's being able to rebuild it from scratch, in your own words, for someone who's never seen it.

Where students get it wrong

• Using jargon as a crutch. Writing "it's due to osmotic pressure gradients" isn't an explanation — it's a label. Force yourself to say what that means with water and cells.
• Explaining to yourself in your head. Do it out loud or on paper. Thoughts feel complete until you try to make them into sentences.
• Skipping the example. A concept you can't attach to a concrete example is a concept you only half-hold.

Use it on your hardest topic

Pick the one topic you're quietly avoiding — the one you "sort of" get — and Feynman it right now. It'll feel uncomfortable, and that discomfort is the map: it shows you precisely what to study next.

Sinau has this built in: open any study pack, go to the Explain tab, and teach the concept back in your own words. It reads your explanation, tells you what you nailed, and points out the exact gaps you glossed over — the honest feedback that's hard to give yourself.