Hi, Scott! I'm glad you joined the course - your comments are bringing it some extra vitality. It would be great to connect category theory more firmly to biology. Right now I'm having the most luck with biochemistry: my recent series of posts on [emergent conservation laws](https://johncarlosbaez.wordpress.com/2018/06/27/coupling-through-emergent-conservation-laws-part-1/) has a secret category-theoretic underpinning that I want to explain someday.