As far as I know, we regard the electromagnetic force, gravity, strong and weak interactions as the four fundamental forces. We know that Newton's law of gravitation does not perform as well as Einstein's general relativity. Scientists are now using energy-stress tensor to describe gravitational fields. Here comes my question: How do we interpret the other three forces? I am more familiar with the EM interaction. Let me focus on it. When I first learn the Columb Force, my teacher told us that it behaves just like gravitation - both decay inverse squarely. Now, we have a new theory explaining gravity. Do we have a new theory for Columb force? I read some articles saying that string theory is trying to do this. My main concern is: do we find any inconsistency between experiments and our Columb Force theory, just like the case of Mercury's precession? I look forward to your comments and opinions!