I gave a "presentation" of my summer work yesterday at a lunch meeting. I was in no way prepared; one of the professors just asked me to get up and give a short talk after everyone else had presented. I stood up and explained my work as best I could (some of it's complicated, and I don't yet understand all of it). I thought it went fairly well: people seemed to understand what I explained.
Afterwards, I spoke to one of the professors about it. He said I did alright, but he didn't understand all the techniques I talked about. That really frustrates me. In my work, I use standard biochemistry tests (such as running a Western to determine relative protein concentrations). I don't think I do anything that is particularly out of the ordinary. However, only some of the chemistry professors understand the reasons for, or goal of, my techniques. The prof I spoke to just reminded me that, next time I give a talk (when it's not sprung on me last minute), I need to take a few minutes to discuss the techniques I use, how they're run, and what the goal of the techniques are. I suppose it's good feedback -- it's just frustrating. Perhaps biochemistry really should be its own division.