IS THERE A DOCTOR IN MY POCKET?

IS THERE A DOCTOR IN MY POCKET? Hmans have always dreamed of better, fitter, longer-lasting bodies. But while many science-fiction fantasies, from videophones to self-driving cars, have been realized, health technology has lagged behind our hopes. Artificial organs and smart pills have been a long time coming.

One of the most exciting aspects of digital health is the capacity of mobile phones to gather information as well as deliver it. They can collect data from their own sensors and screens, as well as associated devices such as watches, headbands and the growing constellation of add-ons.