Every time you use your cell phone, you leave behind a few bits of information. The phone pings the nearest cellphone towers, revealing its location. Your service provider records the duration of your call and the number dialed. Some people are nervous about trailing digital bread crumbs behind them. Sandy Pentland, however, revels in it In fact, the MIT professor of media arts and sciences would like to see phones collect even more information about their users, recording everything from their physical activity to their conversational cadences.
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