Screens are virtually inescapable. What are they doing to our health?

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They're in our pockets, workplaces, homes and schools — screens are everywhere. Americans are spending more than seven hours a day looking at screens. What is this doing to our well being? And does all this screen time affect different generations differently? Horizons moderator William Brangham explores what we know and don't know with researchers Kostadin Kushlev and Courtney K. Blackwell.