Where's the triple, quadruple slit experiments?? What if there's more than one observer? 4 observers and 5 slits? What if the observer is an animal, that's totally ignorant to the experiment or a blind person who's not really observing anything? What if you could delay, or increase the time which observers see the experiment. Will results change over time? What if past observer time travels to future observer and they observe together? Would that cause changes in the past or in the future?