Time isn’t real.
It’s a running joke among colleagues. You think that deadline is tomorrow? Wrong. It’s today. Time isn’t real, that explains it.
The 1980s weren’t actually forty years ago? Nah. Time is fake.
If aliens looked at Earth right now from a passing ship, would they see dinosaurs? Or just magma seas? Definitely not real time.
But jokes contain truth kernels. We don’t understand time. Not physicists. Not philosophers. Anyone. We’ve been bashing our heads against this wall since humans could count. There are ideas, sure. Some plausible. Most aren’t. But no solid answers.
I called Stephen Wolfram. Physicist. Computer scientist. Maker of tools that actually work for people like us. For decades, he’s built the “Wolfram Physics Project.” A massive, controversial attempt to rewrite physics as computation. Not math. Not thermodynamics. Computation.
It makes the universe one giant computer.
If he’s right, we finally know what time is. Why it moves forward. Why we can’t see next Tuesday.
I asked him the basics.
What is time?
“Time is the irreducible doing of computation.”
Done? No. Please explain.
It means what we feel as time is just the universe computing its next state. One step. Then another. Like a flipbook. Images stack up to trick the eye into seeing motion.
Is it that simple?
Close. But here’s the kicker. If the universe runs on fixed rules, why can’t we skip ahead? Why does time pass inexorably?
He calls it “computational irreducibility.” A phrase he’s been shouting about since 1984.
How does this stop me from traveling to 2090? Or checking the stock market tomorrow?
Traditional science taught us a shortcut. Find the rule. Write a formula. Plug in t for time. Skip the middle stuff. Don’t need to know step one to know step ten.
Computers don’t care about that.
Wolfram says you often cannot reduce the effort. No formula gives you the answer for step a-billion. You have to run the computation. Every single step. Explicitly.
No shortcuts.
It’s like calculating the digits of pi. The 1200th digit looks random. It is random-ish. But there’s a process. You can’t just guess the 1200th one. You must compute the first 1199 first.
Like climbing stairs in the dark?
Exactly. You don’t know where the next step is until you land on it.
Wait. Stairs are predictable. That’s the point of stairs. If stairs were randomly generated, you’d break an ankle. We live on predictable stuff. That’s why we survive.
An irreducible computation? That’s climbing really bad, invisible stairs. Doable. Hard. Focus required. You can’t skip a step.
So no time travel. No future predictions. Because humans are slow.
Yes. We are “computationally limited.” Show us an encrypted message. Can we read it without the key? No. Our brains can’t try every possible decryption instantly. We are bounded. We can’t do the billion steps needed to out-run the universe.
What if I had a faster brain? What if I was a better climber?
Then yes. If you had a computer running twice as fast as the universe itself, you could predict the future.
But where would you build it? Inside the universe? You can’t build a machine faster than the stuff it’s made from.
You can’t out-predict the system from inside the system.
So are we trapped in determinism? No free will? Just code running out?
Bad question.
In a deterministic model, you assume you can predict the end from the start. That’s the definition of “no free will” in the old physics view.
But irreducibility breaks that. To know the end, you must run the code. You, the observer, and the system, run at the same speed.
You can’t outrun your own life. You have to live it.
This is a limit on science? Yes. Science loses its crystal ball.
But it also saves meaning.
When we experience time, we’re doing the computation. That effort matters. It isn’t predetermined in a way we can see.
So free will doesn’t matter?
The existence of laws doesn’t erase choice. It just hides it behind complexity. Simple rules make crazy results.
What if there were no rules? Total chaos? Random actions with no cause?
Then physics is dead. No laws to find. Just “hmm, weird stuff happened.”
We want laws. We need them to function.
As soon as we accept laws exist, the idea of “I can just decide to become a floating orb now” dies. You can’t break physics.
So where does the feeling of free will come from?
Here. Computational irreducibility.
If I could predict your life a year in advance, you’d be a passenger. A zombie in the car of destiny. You wouldn’t feel choice because the answer was already printed.
Because the calculation takes effort to resolve, you have to do the work.
That work?
That’s the illusion. That’s free will.
