For most of the past decade, consumer electronics have marched toward ever-smarter, ever-more-personal roles in our daily lives. We followed the trends for many years, but the latest shift is more surprising than any step counter or sleep tracker: everyday gadgets are starting to behave like medical devices. The idea that a pair of mass-market earbuds can assist with mild hearing loss, or that a wristwatch can detect atrial fibrillation, […]