Sara Imari Walker

It's amazing.

Anyway, sorry.

I think it might be possible.

It's an interesting kind of thought experiment about whether the universe is deterministic and fully predictable.

And I think in the past, one of the reasons that we think the laws of physics are deterministic is because in the past you can determine things, but I think the future is undetermined until it happens.

So it might be possible, but I don't know how much you can reconstruct because things die out, like extinction of entire lines of life or things disappear, like they don't exist anymore anymore.

And so I think that you can reconstruct the past, but I don't believe personally in an exact history for the universe.

Like in principle, it makes sense.

But I think in practice, I'm not even sure that's physically possible because as you're like trying to compute everything that the universe has done, you also have to like make sure that that physical thing actually can calculate itself and continue to exist in the future.

So if you're like there, it's not it's it's it's.

It's an interesting thought experiment about, like, how much of the universe can be computed.

But you have to deal with resource bounds.

And so, like, you have to deal with an actual physical implementation of that computer.

And that computer has to be able to persist long enough to do the calculations and have enough energy to do it, which means there has to be things external to the computer.

So you can't use all the resources.

available just for the computer like the compute you actually have to keep the whole thing running so right so I don't think that you actually can know the past with with exact right I was going to say infinite resolution but I don't believe in infinities anyway but like really precise resolution that you could you could reconstruct everything that has happened in the history universe I think our universe forgets things and I think it does so on purpose because that's part of them not purpose but like not in an anthropocentric way but

But it does so because the act of forgetting things is actually in part how the universe generates novelty.

If it remembered everything in the past and only those things persisted, like we live in an incredibly boring universe.

We live in a universe that's constantly creating things.

And sometimes it, you know, like some of those things can't be generated anymore, but it makes more space for other things to be created.