The most significant announcement that Apple made in 2014 wasn’t a larger-sized iPhone. It was that Apple is entering the health-care industry. With HealthKit, it is building an iTunes-like platform for health; Apple Watch is its first medical device. Apple is, however, two steps behind Google, IBM, and hundreds of startups. They realized much earlier that medicine is becoming an information technology and that the trillion-dollar health-care market is ripe for disruption.