So everything measures everything, to some extent, since zero correlations are the exception. And all events happen all the time simultaneously. A very strange miniverse! What then guarantees the coherence of behavior of the objects? How to select one reasonable scenario from the chaos where everything happens?An event which occurs at some time ##t## is a property that obtains at time ##t##, under a consistent quantum description of the system. A detector in the miniverse measures an event if the history of the detector is correlated with the occurrence of the event. Measurement itself isn't the event. It's the correlation between histories of events.