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Hey @katyhuff,

This is also built on #5. I've added a decent amount of content and made some comments based on both your comments and content. Let's iterate on this PR as you see fit; I'm happy to change the language as needed.
Here is an interesting paper I found about system dynamics, discrete event and the shift toward agent-based modeling: http://www.xjtek.com/upload/iblock/296/296cb8fa43251a1fc803e435b93c8ff2.pdf