Can someone inform me a bit on the background of this problem, it's experimental testing and it's implications? If I have it right, it involves two particles which are involved in a singular event. If you measure the momentum of the first particle, you not only create uncertainty in it's position, but also uncertainty in the position of the second particle. Am I right? So how has this been experimentally tested? And don't we get a problem as the entire universe can be described as caused in a single event - the big bang?