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When talking about the “threads of quantum entanglement”, what does Professor van Raamsdonk mean is entangled? Are particles in the atom entangled or the atoms or molecules as a whole? Are electrons from different atoms entangled? Can a group of particles as a whole be entangled with another group of particles? Or any particle from any atom can be entangled with any other particle? What makes two things become entangled? What can break the entanglement? Is there another course that continues this topic with more details about those questions?
I feel it more like it is about forcing the thing to give you feedback about where it is located (the measurement). When it is forced to give feedback, it should report some location However our perception and measurement tools do not allow us to measure a thing in many different locations. So the thing cannot “tell” you that it is spread between many locations because you just are not able to receive this information through your measuring tools. So what the thing does when you force it to report its location is it just throws randomly one of them at you.
As far as I could understand from the lectures until now, this relativity of the simultaneity is a universal principle and is valid for all things in our universe. If so, then no matter what are the people in the moving thing doing, they will never agree for the time with the people outside the moving thing – they should always feel it differently. Other than that, it seems to me that if the train’s speed is greater than the speed of sound, there is no way for a sound to be heard both by the people in the train and the people on the platform because the train will go away faster than the sound itself. This is just a try on the subject, please correct me if I am wrong.