Study groups have a deserved bad reputation: four students, one actually working, three circling the same highlighted notes. The fix isn't studying alone — it's that "study group" is doing two different jobs (social company vs. learning) and getting neither. Teach-back is the version that works, precisely because it's structured to make one of those jobs impossible.

Why explaining is the hardest retrieval there is

Rereading lets you gesture at ideas — your eyes slide over the line and your brain says "sure, that." Explaining has no such mercy: the concept has to come out as a working structure or the sentence just doesn't happen. Your partner's confused face is a gap detector that your own nodding-along brain can't replicate.

That's why explaining out loud works even alone — and why a live partner makes it stricter. A wall won't catch you saying "and then it does the thing"; a person will. The Feynman technique is the same mechanism — teach to learn — with the added benefit that your partner can actually answer back.

The 25-minute format

The session fails when it's vague. "Let's explain stuff to each other" becomes a conversation about the weather inside ten minutes. Keep it rigid:

Teach-back also pairs naturally with generated practice: once the gap log shows what's torn, LearnX's Exam Sprints give each person the same concept as questions — so the patching isn't arguing about what the right answer is, it's both people drilling it.