Interactive explanation of the quantum Bell test

Thanks for this. I was confused at the end of the essay as to what the Bell test was actually looking at. To wit, what's the 'rule' used to turn the rotating crystal photon result into a statement?

The wikipedia page here https://en.wikipedia.org/wiki/Bell_test_experiments has a coherent explanation of the Bell test, and a bunch of history on how scientists have tried to rule out the question of 'locality' confounding these tests.

I seem to recall another related quantum explanation recently with graphs showing photons 'choosing' an open path, even when the 'closed' paths are down very long fiber optic cables, but I can't find the link right now.

https://www.youtube.com/watch?v=ZuvK-od647c is a good overview that I really like for Bell's inequality. Worth a watch if you have the time.

Just minor comment: I could not find a way to stop the "autoplay" of the games.

Is there an "advanced" followsup with more technical details and the calculations? I can do them, but I'm slightly lazy.

In case I decide to make the calculations, what are the angles between the polarizers? The graphic shows something like 45° but IIRC it was more interesting to do the experiment with smaller angles.