were shot by Dr. Ann Chambers and her colleagues at the University of Western Ontario using a microscope outfitted with a video camera. In many of the clips, you'll notice the camera focus changing.

No prizes for guessing the first thing you'll need: a microscope. But don't worry if ... Be careful pushing it under the clips that the cover slide doesn't move or crack. Select the lowest power ...

Celia: So, we wanna pull up the first clip. Portela: OK ... And you can see those on your microscope, that you have some dilated pores, and they have a material in them that's sebum, is what ...