Scientists believed this for the longest time, but I’ve recently seen a documentary explaining that, at the very bottom, there’s a giant koala bear. Apparently they’re still trying to determine why it’s smiling.

If our universe requires a being outside it as an origin, why shouldn’t that being itself require another being of even further outside as an origin, and so on?

“inherently probabilistic and can’t be determined” is just another way of saying “random” or “we don’t know yet”.

Well yes, it means “random”. Of course there’s always a chance that we’re just missing something fundamental, but it would mean that literally every model we have is completely wrong. Unless we find indications for that (and there don’t seem to be any so far) I think it’s fair to assume that quantum interactions are actually random.

If reality was not deterministic, the reliability of models and predictions in physics would be upended.

No, because reality is not deterministic, yet the reliability of models and predictions in physics is not upended. There simply are enough of these interactions happening that, in the “macro” world, we can talk about them deterministically, since they are probabilistic. But that doesn’t mean the “micro” interactions are deterministic, and it also doesn’t mean it’s impossible for a “macro” interaction to be non-deterministic - again, the example of Schrödingers cat comes to mind.

You could literally build a non-deterministic experiment right now if you wanted to.

Just pointing this out - we don’t live in a deterministic reality. Quantum interactions are inherently probabilistic and can’t be predetermined. This usually doesn’t matter, but you can chain larger classical systems onto quantum interactions (i.e. Schrödingers cat), which makes them non-deterministic as well.

Pentameter

I need an adult.