The news is full these days of advances in phones and personal devices that will allow us to track and share more and more information about our health. The latest big announcement came from Apple, not long ago, when they announced a partnership with Epic Systems, which is one of the biggest purveyors of electronic medical records around. Each time I see one of these announcements, it's accompanied by a claim about how any day now, patients are going to be able to share all their amazing data with physicians, and how that's going to change everything. Except it's probable not going to. Why? Watch and learn. Much of this is adapted from a piece Aaron wrote for the NYT. All of the links you might want for supporting data and evidence are there: http://www.nytimes.com/2014/06/17/upshot/apples-healthkit-probably-wont-bring-a-new-age.html John Green -- Executive Producer Stan Muller -- Director, Producer Aaron Carroll -- Writer Mark Olsen -- Graphics http://www.twitter.com/aaronecarroll http://www.twitter.com/crashcoursestan http://www.twitter.com/realjohngreen http://www.twitter.com/olsenvideo