We stopped talking, and nobody noticed

Consider all the small conversations you did not have today. The barista, the neighbor, the colleague you passed without stopping. On their own, each one seems like nothing. Together, they add up to thousands of words that were never spoken, and a new study suggests this is becoming the new normal. So what have we traded away without noticing, and is there any reason to want it back? On the show: Steve, Yushan & Yushun