After you read a fact once, why can trying to recall it from memory help you remember it better than reading it again?

Answer: Trying to recall it makes the memory easier to reach later

Reading it again adds new facts that were missing before — Rereading can add detail if the first pass was too shallow, so it is not useless. But once the fact is already present, the stronger move is often to make the mind reconstruct it without the page. That act exposes missing links and refreshes cues. Extra exposure feels helpful because it is fluent, not because it always builds durable access.

Trying to recall it makes the memory easier to reach later ✓ — Right. Retrieval practice is not just a check of memory; it can be a learning event. Reviews report large long-term retention gains relative to repeated studying, and studies of comprehension and inference questions find benefits too. The quiz is doing work while it looks like it is merely asking.

Testing yourself only measures how much you already know — This is the old classroom intuition, and it is incomplete. Tests certainly measure what is known, but memory research shows retrieval can also change what is retained. Feedback helps, yet retrieval practice can work even without immediate correction. That makes a low-stakes quiz more like a tiny exercise than a tiny exam.