This week, we kick off our new series, Emotions 2.0, with a special double episode about the emotions we experience with other people. We often think that emotions like happiness or sadness live inside our individual minds. But if you've ever gone to a music concert in a big stadium or attended a political rally with like-minded voters, you know that emotions can move through crowds in powerful ways. We begin with psychologist Amit Goldenberg, who studies how emotions spread and ratchet up in intensity as more people experience them. Then, we bring you a favorite 2022 conversation with anthropologist Dimitris Xygalatas, who takes us inside the world of fire walking to explore the emotional power of rituals.