Why We Think About the Past is more complicated than simply missing the “good old days.” Everyday tastes, songs, conversations, and ordinary objects can awaken memories we never intended to revisit. Here is what psychology tells us about our unexpected trips into yesterday—and how to return to today.

Why do painful memories seem to linger while joyful moments quietly fade? The answer lies in how our brains are wired. Although we cannot erase painful experiences, we can learn to recognize, preserve, and cherish the moments of joy that deserve a lasting place in our hearts.