I am a Bio major, and not so great in Physics. But I heard Bertello is nice and easy, so took his section. He is nice and very approachable, but likes to even out his class curve. This means for the final even if you have an A going into the final, it's very possible to get a C for your final grade. Well, I didn't have an A going in, but I did have a solid A-/B+. I had perfect homework and lab scores, and did okay on the midterms. I have NEVER received a C before in any class. So glad I'm done with Physics. Btw, Lea is the BEST TA. She explains concepts better than any professor. I never skipped discussion.