Lydia Denworth is a science journalist and author. She is the contributing editor for Scientific American and writes for Psychology Today. Her work has also appeared in The Atlantic, Newsweek, The New York Times, The Wall Street Journal, and Time. Lydia sits down with the Armchair Expert to talk about the biology of friendship, the science of social bonding and the evidence that we are social animals. Dax asks for suggestions to aid social development for kids who struggle to make friendships and Lydia details how friendship impacts mortality and longevity. They also touch on Lydia's work in the Deaf community, quality vs. quantity in friendships and Lydia explains why Monica is Exhibit A in the necessity of friendship.