This kind of thing happens all the time now, but three or four years ago it still seemed momentous and thrilling: a sudden argument at a dinner party (something about Tom Selleck and Burt Reynolds and iconic mustaches of the ’70s) was quickly put to rest when half the people present picked up their phones and started to Google. Observing this, a friend of mine made what struck me as a very clever remark about our “stegosaurus brains.” It didn’t occur to me that only a dinosaur would delight in a dinosaur analogy.