APPLE MADE SOME grand claims for ResearchKit, a software platform it promises will turn the iPhone into a powerful tool for biomedical research. In a synchronized release, independent researchers also rolled out five apps to study an assortment of complicated diseases. It’s an interesting shift in strategy for the world’s most popular smartphone. For the first time, instead of you using the phone to do (nominally) useful stuff, other people will be using your phone, and the useful stuff will be you—or at least, data you generate.