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Walgreens's rivalry with CVS, which was based in Rhode Island and one-third bigger in terms of revenues, colored virtually everything the drugstore chain did. It was a myopic view of the world that was hard to understand for an outsider like Hunter who wasn't a Walgreens company man. Theranos had cleverly played on this insecurity. As a result, Walgreens suffered from a severe case of FoMO--the fear of missing out.

Health care was the most highly regulated industry in the country and for good reason: the lives of patients were at stake.

explained the pitfalls of using blood pricked from a finger. Unlike venous blood drawn from the arm, capillary blood was polluted by fluids from tissues and cells that interfered with tests and made measurements less accurate. "I'd be less surprised if they told us they were time travelers who came back from the twenty-seventh century than if they told us they cracked that nut,"