In 1971, Frances Moore Lappe published "Diet for a Small Planet," a book that promotes a plant-centric approach to eating as being more beneficial for personal and global health. We speak with Moore Lappe as well as her daughter Anna Lappe, who helped update the book. And, in his 2019 book "Talking to Strangers," author Malcolm Gladwell explores the sometimes fatal miscues that occur when we make assumptions about people we don't know. We revisit our conversation with Gladwell.