One you understand that depression is to a significant degree a collective problem caused by something that's gone wrong in our culture, it becomes obvious that the solutions have to be--to a significant degree--collective, too.

Across the world, Hari found social scientists who were uncovering evidence that depression and anxiety are in fact caused by some crucial and growing problems with the way we live today. Hari's journey took him from a mind-blowing series of experiments in Baltimore, to an Amish community in Indiana, to an uprising in Berlin. Once he had uncovered nine real causes of these problems, they led him to scientists who are discovering very different solutions--ones that work.