Okay, so I accepted a fellowship which ties me to a somewhat narrow area of research (which I am definitely interested in) for my first two years of grad school. However, I'd also like to try a different research area that I was also interested in. Since I can't do that one as part of my fellowship, I'd have to do it on top of my research fellowship. Or, of course, I could wait until after my fellowship was complete to research in the other lab, but that would probably set me back a bit for earning my degree. Is it possible for me to work in the second lab on a somewhat part-time basis to gain experience with the field before my fellowship is over? Any advice would be appreciated.