Comparison of the image of a cell nucleus once with a confocal microscope (left) and once including light form all heights (right). wikipedia
However, somehow I was lucky, and had "only" two presentations and one report to turn in. That was even the week before the finals' week :) So I've got more time to focus on research and next week I will get training on the confocal microscope which is a vital instrument in Biophysics: You can travel through your sample and focus on "slices". Often this microscope is combined with a fluorescent microscope so that only certain, dyed parts are illuminated and light from other slices (which are not in focus) is not included in the image.