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The popular period-tracking app Clue is opening up its database of information to a host of researchers around the world, in an apparent effort to bolster its reputation as a science- and research-based product.

Clue, which is based in Berlin, will not only let researchers examine information about its users’ cycles, pain, emotions, and medication use — it will actually pay them a few thousand dollars. Researchers who have signed up to participate are planning to look at how seasons, exercise, and weather impact menstrual cycles, how a person’s gut function changes during the menstrual cycle, and how people feel about their experience with fertility trackers.

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