Hey guys, So I want to simply pose a question. Conceptually, which is the hardest area of science to grasp? This can also be a sub category of a discipline....or anything like that. I'm just curious because I am a PhD student in Math, but my area is actually Mathematical Physics. So I have experience in both math and physics. I've always been interested in the perceived difficulty of a branch of science, versus its actual difficulty so I'd be interested in your opinions. Cheers.