Force of gravity Definition and 101 Threads

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    The Nature of Gravity: Unifying Forces in Physics Through General Relativity

    I have read about attempts such as String Theory, M-Theory, Loop Quantum Gravity Theory, etc. to unify the four forces of physics into one grand unified theory. My question is, why is gravity considered a "force" that needs to be unified into this equation? In General Relativity, the...
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