My mom always taught me if you make cookies put them in a sealed container with a piece of bread to keep them moist. It's true! Somehow the cookies stay moist for weeks but the bread turns hard.
So, what I want to know is: Why doesn't the bread stay moist and the cookies turn hard? I mean, why can't the moisture go from the cookie to the bread? Why is it the bread has to sacrifice IT'S life for the cookie? How does it know that's its job??