The quest to unify different forces is not from today but from many years ago. The unification is like a great advancement in physics. So physicist all over world have tried and are trying to achieve this. The great scientist Issac Newton in 1687 unified celestial and terrestrial mechanics. He showed that same laws of motion and law of gravitation are applied to earth and other celestial bodies like stars, moon etc,. Hans Christian Oersted in 1820 and Michael Faraday in 1830 showed that electric and magnetic phenomena are inseparable. Where there is electric field, there is magnetic field and where there is magnetic field, there is electric field. It is known as electromagnetism as a unified domain. James clerk Maxwell in 1873 showed that electricity, magnetism and optics inseparable and that is unified them. He actually showed that light is an electromagnetic wave. Sheldon Glashow, Abdus Salam, Steven Weinberg in 1979 theorized that weak nuclear force ...