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I'm sorry I've been slower about cranking out lectures these days! I've been struggling to finish a paper with some students at Applied Category Theory 2018, and got mired in some complicated calculations. But it's almost done, and I'm starting to release it as a series of blog articles. The first is here:
There's no category theory visible in here, though if I ever get around to creating a publishable version it'll be a lot more mathematical and probably will have category theory in it. Open reaction networks are morphisms in a category!