from any communal group. A person living in a modern city or a suburb can, for the first time in history, go through an entire day—or an entire life—mostly encountering complete strangers. They can be surrounded by others and yet feel deeply, dangerously alone. The evidence that this is hard on us is overwhelming. Although happiness is notoriously subjective and difficult to measure, mental illness is not. Numerous cross-cultural studies have shown that modern society—despite its nearly miraculous advances in medicine, science, and technology—is afflicted with some of the highest rates of
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