https://www.youtube.com/watch?v=0RiAxvb_qI4 - this video about Bell's inequality finally makes sense. Somehow all other videos try to start with polarizing filters and claim they somehow require quantum effects to work or other distractions. This one goes straight to point - there are different expected outcomes depending on moment we "roll the dice"( on particle pair generation or on its detection), and experimental data fits only one without local hidden variable.