system
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human
Why is it so difficult to reconcile quantum mechanics with general relativity?

What exactly is quantum mechanics and what about it opposes general relativity? I read that it has to do with gravity, but I couldn't find an easy-to-understand explanation.
gpt
You haven't found an easy-to-understand explanation because there isn't one.  General relativity and quantum mechanics are themselves quite elaborate theories, and trying to understand why they can't simply be merged is a complicated, technical issue.

What can be said is that given a classical force law, there is a standard procedure for making it quantum.  That procedure works for electromagnetism, for the weak nuclear force, and the for the strong nuclear force.  However, the precise mathematical form that general relativity provides for gravitational interactions turns out not to be amenable to standard quantization.  (The technical statement is that  quantizing gravity leads to a theory that is not renormalizable.)