Your phone data can be used to determine how depressed you are, which is pretty depressing. Scientists at Northwestern University used sensor data from 28 people's smartphones over a 14-day period. They were able to predict depression using only phone data with an accuracy rate of 86.5 percent. Surprisingly, the study didn't track the degree to which subjects stalked their exes on Facebook.

The researchers found the participants in the study were more likely to be depressed when they logged onto their phone more (68 minutes a day versus 17),  when their GPS data showed they didn't venture far from their home very often, and they didn't have a consistent daily routine.

The study provided a passive, unobtrusive method of detecting depression, though will need to be reproduced on a larger scale with more clinically diagnosed depressed people in order for the results to be verified.

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