I think after weeks of study, I'm finally getting a handle on Gauss' Law. A few ? though. The equation does not specifically state that there is not charge inside the surface. One may think that it doesn't matter if there or isn't...it's alway zero. How come that is not state in the equation somehow? Second ?. So from what I think, Gauss' Law can be used to determine if a charge exists at an infinitesimal point just like derivate can be used to determine the slope of the tangent line at a point on a curve. Why would I want to know if a charge exists at point x,y,z? It's not like the universe is set in amber charges are just sitting at discrete places. They move around.