It was perhaps only natural that as the smartphone came to take over our everyday lives, the principles that had created it would come to seem like the answers not just to problems of the moment (How do I get people to understand this app?) but to problems of the era (How do I get people to understand their health care?). It made perfect sense if you believed that all these problems came down to the way that the machines failed the people who used them—and knowing that those failures revealed a truth about how people made sense of the world around them, and how they expected the artifacts of
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