We gravitate toward people like us; it's human nature. Race, class, and gender shape our social identities, and thus who we perceive as "like us" or "not like us". But one overlooked factor can be even more powerful: the way we speak. As psychologist Katherine Kinzler reveals here, we are forever marked by our native tongue—and are hardwired to prejudge others by theirs, often with serious consequences. Our linguistic differences can also be a force for good, Kinzler shows; being exposed to multiple languages broadens our understanding, helping us to rethink the role that speech plays in our society.