In the late 19th century, it was commonly believed that a criminal or lunatic could be recognized at a glance, based on certain physiognomic tells. “Enormous jaws, high cheek-bones,” and other animal-like features, the influential criminologist Cesare Lombroso wrote, were signs of an “irresistible craving for evil for its own sake.” Today, savvy readers use a similar approach to identify AI writing, by hunting for supposed telltale signs. The em dash and the “it’s not X; it’s Y” construction