 This week we're going to be talking about the breaking down of the cellulose. Cellulose is a little bit different than starch. It has a little bit different connections to the structure, and because of those connections, you have to use some different chemistry to break it down to the point that would be much easier for starch to break down. Eventually, in our next lesson, we'll be talking about how to take those chemicals that you make as their intermediates and make that into ethanol. But we have to go through an extra step here with cellulose.