FRIENDSHIP: The Science Behind 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 the book "Friendship: The Evolution, Biology, and Extraordinary Power of Life's Fundamental Bond," about why friends — even the online variety — make us happier, healthier, smarter, and more successful.

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