system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does a piece of bread placed in the same container as stale or hard cookies make them soft again?

Saw this trick somewhere on the interwebs, tried it on some overdone cookies of mine and it worked like a charm. No idea why.
gpt
Staleness is just a lack of moisture.  A piece of bread contains just a bit of moisture, which can evaporate and soak into the other items, making them no longer stale. Nothing special about the bread, you can use any slightly damp object that's food-safe.