Americans spend nearly half of the day interacting with screens of all kinds -- smartphones, televisions and computers, according to a recent Nielsen report. While these technologies have made our lives better in many ways, it is easier than ever to become addicted to screens. Guest Adam Alter, PhD, author of "Irresistible: The Rise of Addictive Technology and the Business of Keeping Us Hooked" discusses the dark side of screen time and how our devices are affecting our well-being and happiness.

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