First we watched and discussed videos on the carbon cycle, nitrogen cycle, and phosphorus cycle. GT learned about the Haber process, and we looked at a human population graph to help understand the significance of its development. We then watched a video on Fritz Haber and his evil genius role in WWI and II. We then had a lesson on population dynamics and limiting factors. This lead to questions about extinction, so GT got a mini-lesson on the Permian and KPg extinctions.