system
A chat on subreddit /r/NoStupidQuestions
human
Theory of Gravity is not a great example.   Gravity doesn't work like most people think,  There is no "force" that "pulls".   It is simply spacetime warping.    

Theory of evolution though is about as solid as theory can be.   It is very easy to understand and everything fits, despite what the deniers claim.
gpt
This is one of those pedantic things that bugs the shit out of me.  Gravity isn’t a “force,” it’s a “thing” that causes acceleration and can be modeled like a “force” and behaves like a “force” and fits the basic definition of a “force” and can be included in summation of forces, but is not a “force.”  Then what term should we use for the non-force, force-like thing?

Also, if gravity isn’t a force, why is it that EM, Strong Nuclear, and Weak Nuclear are forces?  What esoterica makes gravity’s mechanism a non-force but allows these other forces to be forces?