Science of Friendship w/ Lydia Denworth

In this episode of Talk Nerdy, Cara is joined by science writer Lydia Denworth to talk about her new book, "Friendship: The Evolution, Biology, and Extraordinary Power of Life's Fundamental Bond." They discuss the science of friendship, from genetics to anthropology and beyond, as well as its extraordinary effects on our physical and mental health. Follow Lydia: @LydiaDenworth.