This video is about the quantum eraser experiment. Understanding this experiment helps us understand the measurement problem in quantum physics, and it might even give us a clue for how to solve it.
The write up of the mathematics of the quantum eraser is here: https://looking-glass-universe.teachable.com/courses/quantum-mechanics-fundamentals13/lectures/60992171
It does require knowing the basics mathematics of quantum mechanics though to really understand though. If you're interested in learning that, I have a class that teaches you all the rules of quantum mechanics, without assuming any math. I was teaching it as a live class, but quite a few people requested a self paced version of the course. That's now available here: looking-glass-universe.teachable.com/p/quantum-mechanics-fundamentals-self-paced