A new study suggests people who live happier lives live longer. Erica Hill speaks to the author of "The Happiness Project" Gretchen Rubin and profiles how this philosophy changed the life of one woman.
Read More »A new study suggests people who live happier lives live longer. Erica Hill speaks to the author of "The Happiness Project" Gretchen Rubin and profiles how this philosophy changed the life of one woman.
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