Doing a project in a university, need your help.

Hi. I've choosen a project which I should present in a 4 weeks time. But, I'm not sure if I've choosen the right project. I mean, I'm able to choose one I want to present. THere were many of them, for example, microsoft windows or google... but I stopped between Unix and User Interface. As for now, I'm looking forward to talking about Unix, as I love Mac OS X, but User Interface is quite interesting for me aswell... Now, I really can't choose one. Probably you are the one site I trust, and I hope you'll help me to choose right. Which project is easy to make or which one is more interesting to teach and to speak about. By the way, if you have some information about these projects or about one of these, please put some links here. Need more information about Unix. Thanks