Wearable devices, such as fitness trackers and smartwatches, can measure a growing array of health indicators. Machine learning can filter that torrent of data to reveal a continuous, quantified picture of you and your health. But wearables linked to health apps are not only able to help diagnose diseases—they are beginning to treat them too. We explore the technology that promises to revolutionise health care. Alok Jha hosts.
Babbage from The Economist (subscriber edition)