A look at the evolutionary psychology of friendship with science journalist and author of Friendship: The Evolution, Biology, and Extraordinary Power of Life's Fundamental Bond Lydia Denworth. Then, Tiffany Petricini, assistant teaching professor at Penn State Shenango and author of Friendship and Technology: A Philosophical Approach to Computer Mediated Communication, talks about how digital tech has shaped our friendships and our fundamental sense of togetherness. (This is a repeat of an episode that first aired in Feb. 2022, and has been updated to reflect that.)