So you bought an awesome loaf of bread, but you've neglected it for days. It's probably stale by now.
But wait — don't throw it out. Bon Appétit has a genius solution.
First, be sure your loaf isn't moldy. There is a limit to the life-saving magic you can work.
Then run your bread under water. No, seriously, it'll help.
The water will become steam, which rehydrates the middle. Meanwhile, the heat hardens the crust, Bon Appétit explains.
When you pull it out, your bread should be good as new.