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Well, the phrase survival of the fittest is usually understood to be all about fierce and even brutal competition for survival. What do you mean by that?ĭENWORTH: (Laughter) Yeah. You say it's actually survival of the friendliest. SHAPIRO: We're all familiar with the expression survival of the fittest. She is author of "Friendship: The Evolution, Biology, And Extraordinary Power Of Life's Fundamental Bond." Lydia Denworth is here to explain why that's so important. Well, here's a tip from the Centers for Disease Control and Prevention that we don't hear as often - call your friends. It is a clarion call for putting positive relationships at the centre of our lives.We're all familiar with certain CDC recommendations - wash your hands, don't touch your face, avoid social gatherings. Friendship illuminates the vital aspects of friendship, both visible and invisible, and offers a refreshingly optimistic vision of human nature. Blending compelling science, storytelling, and a grand evolutionary perspective, she delineates the essential role that cooperation and companionship play in creating human (and non-human) societies. With insight and warmth, Lydia weaves past and present, biology and neuroscience, to show how our bodies and minds are designed for friendship, and how this is changing in the age of social media. Lydia meets scientists at the frontiers of brain and genetics research, and discovers that friendship is reflected in our brain waves, our genomes, and our cardiovascular and immune systems its opposite, loneliness, can kill. She finds that the human capacity for friendship is as old as humanity itself, when tribes of people on the African savanna grew large enough for individuals to seek meaningful connection with those outside their immediate families. But what makes these bonds not just pleasant but essential, and how do they affect our bodies and our minds? In Friendship, science journalist Lydia Denworth takes us in search of the biological, psychological, and evolutionary foundations of this important bond. Friends, after all, are the family we choose.

The phenomenon of friendship is universal.