FRIENDSHIP: The Science and Power of Life’s Deepest Bond

Friends aren’t just fun to hang out with and handy in a pinch. They’re also a biological necessity. Rufus talks to journalist Lydia Denworth, author of a new book on the science of friendship, who explains why friends — even the online variety — make us happier, healthier, smarter, and more successful. Support us by supporting our sponsors! Great Courses — Get a free month trial at thegreatcoursesplus.com/bigidea