Digestion Presentation

On Wednesday, February 25, 2009 I gave a presentation on how humans benefit from microbial digestion. The students will spend the next few weeks learning about human digestion, and I wanted them to become acquainted with how people make use their knowledge of an organism's digestion to produce human food and manage human waste.

As part of my presentation, I did a simple demostration of yeast producing carbon dioxide, which is what makes bread rise. See image below.

I think the presentation went well; I told them that if they have question during the course of the presentation, then they should ask them. I'm always afraid of losing them during the course of a presentation because some of the material I presented they haven't covered yet.
The students (I presented to four biology classes) asked questions in each class, and most of them were paying attention.