Minute Physics is tackling Bell's theorem, with limited success.
It would have been nice if they included Malus' Law description in here, because that is what we knew before QM came around, and that is what we teach students in intro physics.
In any case, I still find it difficult to follow, especially if you didn't pay that much attention to the part when they are doing the counting. They went over this a bit too quickly to let it sink in.
Maybe your brain works faster than mine and can keep up.