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Director of the Positive Emotions and Psychophysiology Laboratory at UNC, Fredrickson is best known for her broaden-and-build theory of positive emotion, which proposes that positive emotions have been evolutionarily adaptive. Her new book, Love 2.0, provides a new conceptualization of love-positing that instead of thinking of love strictly in terms of romantic or passionate relationships, we should be focusing more on momentary interactions and ordinary, everyday experiences that generate the emotion of love. She reviews interesting research on social behavior and biological correlates of these moments of experiencing love, and concludes that they cumulatively impact health and longevity.