Thats when timeline and parallel world theories comes into play. Since there is no method to prove or unprove such theories it is difficult for scientist to determine the solution. Eg. Instead of cat we put a human in the box which is dead and alive at the same time. The alive one has an option of stopping the gas with a switch. If he does so observer will find him alive and at the same time if he is found dead people will start to say that there is a parallel verse where he is alive so it is hard to disprove.