zlacker

>>qqqqqu+(OP)
Bell's theorem. It somehow proves that quantum physics is incompatible with local hidden variables, but I could never see an understandable explanation (for me at least) of just how it works.

>>lpelli+ag
Perhaps you can try the following article, as it was the simplest and clearest explanation I've found anywhere:

https://www.physics.wisc.edu/undergrads/courses/spring2016/4...

AFAICS it was published in the American Journal of Physics in 1981 but it's addressed to the general reader. It requires no knowledge of quantum physics.