Laura and Leah discover they use the same mysterious astrology app, The Pattern. They try to figure out how it works, who owns it, and what The Pattern is really doing with their data, which takes them all the way across the country to a mailroom in Manhattan. Along the way, they consult with Serge Egelman, the research director at UC Berkeley’s International Computer Science Institute, who reveals the answers to an even scarier question: What access do we unknowingly give away to all apps on our phones?

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