Marcia et. al,

Hugh Everett explained the photon slit experiments by saying that every quantum event has every possible outcome and we are in the particular universe where the photon did such-and-such while other parallel right up to then universes just split off with their unique result and went fowrard sliliting off their infinities. This means an infinity of yous and mes whose lives took infinitely different paths and of course infinite parallel universes where we were not conceived and so on. There would be an infinity of worlds where the dinos didn't get nuked 65MYR ago.

As mind-blowing as it is, I personally prefer Everett's take as opposed to the 'standard' Copenhagen view with its strangely contrived 'observer' collapsing the waveform. I like to think that the power of positive thinking somehow has a quantum entanglement that pushes you forward into a quantumverse where the outcome you want comes true. :)