David Vivero

In a world where you can access nearly all human knowledge from a device in your pocket, it’s absurd that you still can’t find out how much having a baby will cost you. But it’s not surprising. “Health data” is such a hot topic these days that you’d think it was a recent invention, and in many cases you’d be right. Apple AAPL +1.97%’s HealthKit and other trackers passively gather exabytes of our health data as we move around. Saliva samples let us explore genetic conditions. A handful of companies can discover the bugs living inside our guts...

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