I know E=mc2 has provided many uses such as nuclear power plants, medical testing machinies, and open the doors for understanding atomic particles. For me, my favorite use for E=mc2 is the creation of science fiction story-lines such as Star-trek, World War Z, and the Avengers.
I would compare the four forces in relation to how their size influences their actions. Gravity, for example, is considered the weakest of the four forces because it takes a tremendous amount of mass to create a very powerful gravitational field. Electromagnetism has similar properties to gravity such as infinite range but differs in that electromagnetism can have attractive and repulsive attributes that will combine or cancel each others attributes. For electromagnetism, the stronger the attractive force field generated means a smaller overall mass, and the weaker repulsive force is generated by a larger overall mass. For the nuclear forces, they are both very strong because they work on the atomic nucleus level. Weak nuclear force is considered less strong because the messenger particles can not always transmit it's strength because the particles are very large and slow. Strong nuclear force has the responsiblity of keeping atomice particles organized within each other. This takes a great amount of force to keep quarks inside protons and neutrons. Not to mention this same force must keep the protons and neutrons inside the atomic nuclei.
In my opinion, I think gravity's duty is to be the communicator between the remaining forces. Gravity may act as the initiator or reactor depending on what the other forces need to create or maintain their force field. Another task of the communicator is to combine or separate the forces as needed for what the situation is called for. The reason that gravity is considered the weakest may be so that it has a less invasive way of interacting with the other forces.
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