A Disambiguation of Living Alone

“Why are so many Americans living by themselves?” Nathan Heller asks in “The Disconnect” (New Yorker, April 16, 2012). “Today,” Heller says, “half of U.S. residents are single, and a third of all households have one occupant.” We’re in the world of the sociologist, but while this issue’s “Table of Contents,” titled “Journeys,” promises “How…