I like that they talk about their favorite tools and toy models. In grad school, I had a number of toy models and I got to use some of my favorite tools in my

I like that they talk about their favorite tools and toy models. In grad school, I had a number of toy models and I got to use some of my favorite tools in my research/thesis write up. For me, one of my favorite tools was a form of perturbation theory which I could apply to all sorts of things. Didn't always work, and I think I annoyed my thesis advisor with it.