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In 2009, researchers at the Massachusetts Institute of Technology gave a dorm full of students smart phones and tracked where they went, whom they called and texted, and at what times they communicated.
So in November 2010, Madan and his classmate Karan Singh, both 29, started Ginger.io to mine those diaries and provide the kind of detailed, persistent health monitoring that doctors and researchers have only dreamed of...
