I guess all models are wrong but some of them are useful. And more useful than others— > In the first sentence, he told me he was majoring in English Literatur

I guess all models are wrong but some of them are useful. And more useful than others— > In the first sentence, he told me he was majoring in English Literature, but felt he needed to teach me science. (I sighed a bit, for I knew very few English Lit majors who are equipped to teach me science, but I am very aware of the vast state of my ignorance and I am prepared to learn as much as I can from anyone, however low on the social scale, so I read on.) I couldn't imagine writing the parenthetical.