In 2017, the fact that companies have access to personal data about us is common knowledge. But the data available to companies goes beyond just what websites you browse and where you’ve checked in on social media. Your (anonymized) medical information can be sold to drug companies to promote drugs - and to sell those to doctors in a process that is, shockingly, legal. Adam Tanner, a writer-in-residence at Harvard’s Institute for Quantitative Social Science, has written a book on this called “Our Bodies, Our Data: How Companies Make Billions Selling Our Medical Records.” We talk with him about the alarming trade in health data.