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Pet therapy dogs bring normalcy and comfort to an otherwise sterile environment. CBS News correspondent Debbye Turner Bell reports on this new field of study and how it changed the life of a young girl with a rare neurological disease.

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.

Dr. Jennifer Ashton reports on how gene mapping changed the life of one set of California twins, who from birth suffered one mysterious illness after another.