There was an experiment where they thought that the both particles have this information in them already. If one is measured spin up the other will be spin down and vice versa. Some theory thought that they have this information in them before they where even measured, but it proved to be wrong.
if we think of two entangled particles as closed system, yet they are one million light year apart, in witch medium are they in ?
I have a moderate grasp on the quontom mechanics and entanglement, but i cant quite understand this.