Friendship: The Evolution, Biology, and Extraordinary Power of Life's Fundamental Bond
Lydia Denworth · 2020
Friendship (2020) is a book by Lydia Denworth on Friendship & Social Connection. A science journalist reports from primate field sites and labs, and from her own decades-long friendship and her sons' social lives, to show that close non-kin bonds are an evolved adaptation with measurable effects on health, stress, and survival.
Reported science woven through the author's own long friendship, quietly reclassifying friendship from a luxury of leisure time to a biological requirement.
Two of the ideas you’ll keep
The Clif summary of Friendship pulls out 7 insights. Here are the first two.
- Friendship qualifies as a biological adaptation, not a cultural luxury: it appears across social mammals, shows up in physiology, and predicts survival, the kind of evidence a trait needs to count as evolved.
- The Harvard Study of Adult Development, one of the longest-running longitudinal studies of adult life, found that the quality of people's relationships at midlife predicted their later health, a result produced by George Vaillant's analysis of the data and popularized later by the study's current director.
The other 5 — and the full 11-minute summary — are in the app.
What’s inside: 9 chapters
The whole summary runs about 11 minutes, read or listened to.
- Monkeys with Preferred Partners
- Bonds That Pay in Fitness
- The Social Brain
- How Children Learn to Be Friends
- The Adolescent Sensitive Period
- Loneliness Gets Under the Skin
- What Makes a Friendship Good
- Friendship in a Digital Age
- Tending the Bond
Finish Friendship tonight.
Read or listen to the full summary in about 11 minutes, then keep the ideas with a minute of review a day. Start with the 2-minute quiz — no card required.
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