There’s lots I don’t understand. Quantum physics, for one! 😛 I think the more I learn about a subject, the more I know that I don’t know. Biology was the only science in school I didn’t do, so it’s the one I’m least keen on.
Haha so much. In fact my physics knowledge is pretty limited to optics and even then it’s not great. The trouble is the further you get in science the more specialised you become. That being said I’m always interested in new things but with developments happening so fast in my own field it’s difficult to keep up with whats going on elsewhere.