The goal of this report is to explore this question as modern theory might approach it. We will find that the subtext of the question, a profound skepticism about the postulate of wave-collapse, remains unanswered.
The theoretical program of decoherence can ``effectively'' replace the wave-collapse and even tell us how long the transition from the quantum realm to the classical realm will take. Though we are still left with a mystery, it is a mystery which has been pushed off the table in regards to experimental physics.
Timothy Jones