Today's interactions with technology leave digital traces that are a potential font of insights into our lives. Emails contain receipts of our social and business transactions. Phones record our locations, estimate our physical activity, and infer how we traveled between different places. Wearables collect increasingly reliable and detailed data about our physical activity, while researchers keep finding ingenious ways to repurpose the sensors in personal devices to collect an ever broader range of data about our health and the everyday factors that affect it. Insights In 2010, Ian Li, Anind Dey, and Jodi Forlizzi published a model of…
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