Quantum Mechanics, the theoretical Higgs Field, Super String Theory and its 10 or 11 dimensions, all the damn math, all the unexpected particles and wave functions and non-zero vacuums, etc.
Sure, experimental evidence has brought all this stuff to our awareness, but doesn’t it feel like we’re missing something? Something big. Something that’s going to tie it all together and make it simple and beautiful.
I’m just a fan of physics, I don’t understand anything more than the layman interpretations of it all. But it seems like there’s something grand out there that we can’t see yet. Yes, this is what keeps me awake at night. Just wondering what actual, real-live physicists think about it.