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So ELI5. In physics there are 4 fundamental forces. Strong, Weak, Electromagnetic and Gravitational.
Strong and Weak act on quarks, protons, electrons, etc.
Gravitational act on large masses. Electromagnetic act on charged particles.
The issue is we haven’t been able to link all 4 of these forces together in a workable model yet. We can do the general relativity stuff of large masses and gravity but when you take it down to the quantum level where the weak and strong forces are, the math doesn’t work out any more and if you take the quantum level stuff up to large scale, the same thing. This has been something scientists have been working towards for decades and where string theory and n-theory and loop quantum gravity all arose from is trying to get all 4 of these forces into 1 universal model. We still have yet to achieve this.
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