More than 20 years ago, two philosophers, Andy Clark and David Chalmers, wrote a journal article that opened with a question: “Where does the mind stop and the rest of the world begin?” Now, that question would seem to have an obvious answer, right? The mind stops at the head. It’s contained within the skull. But Clark and Chalmers maintained that

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We can extend our minds with the social interactions we have with other people.

So often, we assume that real thinking—serious thinking—is done alone, bent over a book or a notepad. But in fact, humans think best when they are interacting with others. Social activities like debating, storytelling, and teaching activate mental processes that remain

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