Psychologist Daniel Gilbert ("Stumbling on Happiness") hosts this three-part look at the emotional side of life.

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The first episode looks at the importance of relationships and why they are central to our emotional well-being. What are the cognitive and neurological processes underpinning our everyday interactions, and can they help us to understand why some relationships flourish and others fail?
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The last episode explores happiness. It is critical to well-being, yet it remains such an elusive goal for many. What is it, why is it important and how can we attain more of it? Viewers meet individuals facing major turning points in their lives - a job loss, a cancer diagnosis, the death of a child, an accident - as well as those facing more common struggles.