In the Copenhagen interpretation of QM, properties of a system begin to be realistic when the observer makes appropriate measurements and observations. Does it mean that the laws of QM were inconsequential about 2 billion years ago when nobody was there to make observations? This problem does not arise if we take the statistical interpretation. However, then one has to accept that QM does not provide a theory for individual events. But what is the need if the results of individual events are random due to microscopic nature of the systems?