What made the subject so compelling for him boiled down to this: “Most of us are comfortable with the idea that a painkiller or drug might modify our behavior, but there’s something very different about a small parasite—a few hundred or thousand of these single-celled parasites—that’s in your brain for your entire life. And because you can’t get rid of them and you don’t know that they’re there, like at what point does all of their influence just become who you are?”
