Theory of General Relativity is useful for describing the interactions of large bodies i.e the world as we see today.
Electromagnetic Theory(EM) - Comes from Maxwell in four equations. Described the similarity of Electricity and Magnetism.
Strong Nuclear Theory(S) - Describes the interaction of protons and neutrons in an atomic nucleus
Weak Nuclear Theory(W) - Describes the interactions of the electrons
According to Einstien, there has to be a unified theory for all these 4 different theories.
Now Scientists have combined the EM,S and W theories into one theory called the standard model.
The answer to a single theory is now believed to exist in the Sting Theory
String theory - everything in the universe is made of tiny vibrating strings.
But there were not one but five theories that could be possible each giving a unique number 496.
Edward witten unified them into M-Theory as saying that these are just 5 ways of looking at it or just like 5 dimensions
In fact he said there are 11 dimentions for the String-Theory and this is called the M-Theory (Magic/Mother theory)
Now there are particle physics labs at FermiLab and CERN that are in search of these seven particles. Gravitons and S particles etc
