Do you trust Jeff Bezos with your life? Tech giants are getting into the health care business

Do you trust Amazon with your life? You might have to, because the big tech companies of Silicon Valley are looking to do for medicine what they've already done for retail, publishing, finance and other sectors of modern life: they want to bring on another digital revolution. Ever since the Federal government began encouraging health care providers to adopt electronic health records a decade ago, Apple, Google and a slew of Silicon Valley startups have sought to bring about their own vision of telemedicine--turbocharged by data from wearable health-monitoring devices, artificial intelligence and smartphone apps. Apple's bio-monitoring watches and Fitbit, the wearable exercise monitor recently bought by Google, are two prominent examples of products in the market now. Other companies are readying artificial-intelligence products that could augment or replace advice from medical professionals. So far all these promising technologies have failed to bring about the kind of sweeping change that Silicon Valley has wrought in so many other industries.