> No, consider the case of neutral pion decay, which emits one spin up electron and one spin down electron. No, it does emit two electrons with total spin zero

> No, consider the case of neutral pion decay, which emits one spin up electron and one spin down electron. No, it does emit two electrons with total spin zero which is not the same thing. > We can clearly say ahead of time one electron will be spin up, and the other will be spin down. Let’s imagine that one was really up and the other was down. But you decide to measure instead the spins along a perpendicular axis. You would expect to find no correlation between them. However, what you actually see is that if you measure both spins along any (common) axis they will point in opposite directions. It doesn’t make any sense to say that before any measurement one was up and the other down. The red and blue balls analogy is very misleading and has nothing to do with entanglement.