In this episode, we speak with Deborah Estrin. She’s a professor of Computer Science and an Associate Dean at Cornell Tech. She works on "small data" : the individual traces we leave behind us online. How can these seemingly uninteresting digital "breadcrumbs" help us improve our health? And how can we use them without sacrificing our privacy? We discuss participatory mobile health, we talk about our digital dependencies, and we ask Estrin about the "Genius Grant" she's received last year.