Now this is something that just came to mind. As an undergrad Physics major, I have already taken a few introductory Physics courses. We have studied gravity, electromagnetic forces, etc. All of the work we have done involved measuring these forces and understanding how a body will react while under the influence of said forces. Anyway, have scientists been able to figure out why these forces exist? For example, we know that the gravitational force explains why the Earth orbits the Sun the way it does. But what causes this attractive force? The same applies to the electromagnetic force. Have I missed something really important, or is there no explanation for this as of yet?