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There are 4 fundamental forces. The electromagnetic force, the strong and weak nuclear forces, and gravity.
Unified field theories aim to “unify” these 4 forces into different aspects of the same force.
We have already succeeded in the unification of the electromagnetic force and the weak nuclear force.
The main obstacle in creating a unified field theory is gravity: our current description of gravity is based on classical mechanics, whereas everything else is based on quantum mechanics.
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