Mapping Happiness

So much has been written about the search for happiness — in songs and poems and countless self-help books — much of it straight from the heart.

But it turns out there's also a science of happiness, and in her new book a psychologist lays out the cold, hard facts, based on decades of research.

Did you know you have a happiness "set point"? What do you really need to be happy?

Her book is part science, part self-help, with questionnaires and exercises. We'll give it a try.

This hour, On Point: mapping happinessGuests:

Sonja Lyubomirsky, professor of psychology at the University of Riverside and author of "The How of Happiness: A Scientific Approach to Getting the Life You Want."

Eric Wilson, professor of English at Wake Forest University and author of "Against Happiness: In Praise of Melancholy."