I am having troubles finding anything online that reveals the conceptual concerns relating to the probability wavefunction in regards to the travel of a particle and then how that plays into the double-slit experiment. No math is required. I merely need to know the concepts involved. 1) exactly what is being implied concerning the path of a particle by the wavefunction? 2) exactly how is that notion being applied such as to explain the double-slit phenonema? Thks.