What makes more money in the United States than movies, game parks and baseball combined? Slot machines. In this thoughtful TEDx talk, designer and computer scientist Tristan Harris argues that our culture has unconsciously turned our mobile devices into slot machines -- where instead of coins, we are paying with our time. What if technology could distract us less, and respect our time and attention more? What would that world look like - and how could it be built? How do we measure time spent versus time well spent?