The Conflict Between Theory and Theory

People are trying from all sorts of directions to unify these things. One set of theories is saying, well, let's take quantum mechanics and try to do it in curved space. And that actually kind of works if you have space that already curves for other reasons. What we don't know how to do is show how quantum mechanics can make space curved. To show how having a bunch of electrons in one place will make space curved has never been done mathematically.