Psychologist Jonathan Haidt asks a simple, but difficult question: why do we search for self-transcendence? Why do we attempt to lose ourselves? In a tour through the science of evolution by group selection, he proposes a provocative answer.

Jonathan Haidt studies how -- and why -- we evolved to be moral. By understanding more about our moral roots, his hope is that we can learn to be civil and open-minded. His new book is "The Righteous Mind: Why Good People are Divided by Politics and Religion."

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