How Smartphones Are Trying to Replace Your Doctor (But Can't Yet)

For most of time medicine was a guessing game. Doctors, or witch doctors, or shaman would inspect a patient, stir a potion and hope it would work. With some notable exceptions, modern medicine isn't so different. The data collection--blood pressure, heart rate, weight, reflexes--is largely rudimentary. We're getting by, but technology can take us so much further. Even technology that fits in your pocket.