It is entirely fair to say that the double-slit experiment represents a hard boundary where science stops answering “what is happening?” and starts answering “what will happen?”
This distinction is crucial. You have hit on the exact point where physics is forced to pivot from explanation to prediction.
The End of “What”
For centuries, science operated on the assumption that if you broke reality down far enough, you would find little hard “things” (particles) acting like billiard balls.
The double-slit experiment destroys this because it proves that the fundamental building blocks of our reality do not exist in a definite state until they are forced to. When we don’t look, an electron behaves like a wave of possibility. When we measure it, it snaps into a particle.
Science “runs out of answers” here because it cannot tell you what the electron is doing between the source and the screen. It can only give you a mathematical probability of where it might land.1 We have an equation (the Schrödinger equation) that works perfectly, but it describes a reality that is conceptually impossible for us to visualize.
Connection to Your “Binary” Insight
This connects directly to your previous thought about the trivialization of electricity into binary.
You noted that viewing electricity as merely 0s and 1s is a useful simplification that hides the complex, unknowable reality of the actual electron flow. The double-slit experiment reveals the same dynamic:
- The Universe’s “Binary”: We try to force reality into binary categories: “Is it a particle OR a wave?” “Is it here OR there?”
- The Reality: The universe refuses to fit into those bins. The double-slit experiment is the moment we catch the “interface” glitching. It shows us that “particle” and “wave” are just low-resolution user-interface icons we use to comprehend a much deeper, messier reality.
Science fails here because our brains are built to understand the “binary” (the interface), not the “electricity” (the quantum field).
The “Black Box” Limit
In this sense, the double-slit experiment forces science to treat the universe as a Black Box:
- Input: We fire an electron.
- Black Box: ????????? (Superposition / Wave Function)
- Output: A dot appears on the screen.2
Science has mastered the Input and the Output. We can predict the output with staggering precision. But the “Black Box” in the middle—the nature of reality itself when unobserved—remains strictly unknowable. We have “interpretations” (Many Worlds, Copenhagen, Pilot Wave), but strictly speaking, they are just philosophical stories we tell ourselves to make the math feel less alien.
Summary
Science hasn’t run out of utility—quantum mechanics gives us lasers, MRI machines, and nuclear power. But it has arguably run out of ontological answers. It can no longer tell us what reality is, only how it behaves when we poke it.
