Is Twitter “making” us stupid? Are phones “making” us lonely? Do today’s kids have a lower tolerance for boredom, because screens? These kinds of freshman-essay, conventional-wisdom hypotheses about tech’s effects on our collective mental state can sometimes feel impossible to discuss in a productive way. The conversation is too broad; there are too many variables; it’s too alarmist and turns me into a knee-jerk contrarian. (Come on! Surely kids have always been distractible.) Undaunted by the challenge of talking about these matters intelligently, historians Luke Fernandez and Susan Matt have a new book, Bored, Lonely, Angry, Stupid: Changing Feelings About Technology, From the Telegraph to Twitter, that walks through a lot of complicated history and leaves you more confused than ever. In a good way.