You don’t remember the past—you remember the direction of collapse. Press enter or click to view image in full size Photo by Brian McGowan on Unsplash It sounds like a poetic exaggeration—something that belongs more to midnight thoughts than physics. But follow the logic carefully, and it becomes less metaphor, more diagnosis: You remember the past because the universe is falling apart. Not violently. Not catastrophically. Quietly. Statistically. Inevitably. Every experience you’ve ever had shares one constraint—you can only recall it in one direction. You remember yesterday, not tomorrow. Childhood, not next week. Your mind is not symmetric in time, even though the equations that describe reality almost are. And that’s where the tension begins. Because at the deepest level we understand, physics does not care about “forward.” The equations governing motion—classical mechanics, electromagnetism, even much of quantum theory—are time-reversible. Run them backward, and they still hold.…