I'm trying to understand quantum entanglement. For instance, how do you entangle 2+ quantum particles? How do you know they're really entangled (how do you know something special is going on)? I've read that some scientists think that quantum wave-functions are real things. http://www.nature.com/news/quantum-theorem-shakes-foundations-1.9392 Would anyone like to share their knowledge? The topic is huge and I have a lot of questions. Is quantum entanglement some kind of magic? In the case of electron spin, I think of it as a coin toss where the head and tail can be separated over a distance, yet connected by some unseen agent (like a wave-function).