I have been told that radioactive decay, photon emission and absorption, and other such subatomic events are not deterministic. That besides leaving no clue as to when the event--say, decay--will take place, QM also has found that there IS NO initiating process that kicks off the event. In other words, decay events are uncaused. This, of course, goes beyond the mere inability to predict an event, but speaks to a very fundamental, and exceptionally unique character the subatomic world. My question then, is: Are such events at the subatomic level, such as radioactive decay, truly without cause, or is it still simply a matter of we don't or can't know the cause?