If no solid, empirical evidence was provided for every statement of what I'm learning, my brain defaults to "STOP" understanding/memorizing what I'm studying. Genetics gave me such a hard time because I never understood why the gay molecules were doing what they were doing and not something else.
Haha, I'm the opposite. Chemistry was bleh in HS for me, but any med school would require it, so I'll take it when I transfer. Physics was fun in some cases, I've never been good at math though. X_x
I love anything that has to do with science, but Biology is not my favourite discipline because I don't trust the "theories" behind it. Mind you, it has a lot of impurities.
And by theories, I don't refer to evolution. I refer to everything =p lol. I'm more into chemistry, physics, and mathematics. <3