Avi Loeb

You could go back.

You're going through my whole list right here.

Oh, okay.

That's great.

No, because if you control gravity, you control time, it's the same.

Yeah, you can get back in time.

And then the question is, well, if you were to meet your grandparents and convince them not to get married, how can you actually exist?

The grandfather paradox.

Yeah, so most physicists, if you were to ask them, would argue it's not possible because you get into logical inconsistencies.

But maybe it's possible with some caveats, like any legal document has caveats.

So maybe you can never speak to your grandparents in a way that will convince them not to get married because you wouldn't be able to say that.

Or you wouldn't remember that your brain, the memories depend on the arrow of time.

So maybe you wouldn't be able to design a system that will go back and do a task for you because as you go back in time, the system would change.

There's a somewhat recent theory about time travel regarding block universe theory where you can't go back and kill your grandfather because you didn't.

Well, how do you know I didn't?

Because you're here, so you didn't.

So that kind of solves the paradox.

One way that I phrase it is that no Jew, no Jewish person had access to a time machine in the future.

Why do I know that?

Because they would go back in time and kill Hitler.