Where does the gravity and matter/energy interaction come from?
It doesn't come from anywhere, matter/energy/gravity exists, something rather than nothing, cyclic, quantum fluctuations, multiverse.....nobody knows...not even those who assert 'God did it'
if we're willing to first assume a god, then that gives us a ladder to climb up out of the hole in the ground.
usually, i've depended upon monetary theorists, and macro economists to supply the ladder.
but, probably god could do the job just as well. maybe better. i don't know.
