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Melissa Block speaks with Ladar Levison, founder of the secure email system Lavabit, about how he defied orders to hand customer information over to authorities, which led to fines and his decision to shut down his business.

He defied a military dictator, sacked a prime minister, and persistently called generals and intelligence chiefs to account. Now, Iftikhar Chaudhry has retired after a tenure that changed the balance of power in his turbulent nation.

The wildly popular photo-sharing site Instagram nearly caused a user revolt when it revamped its terms of service and privacy policy to suggest it could allow uploaded photos to be used in ads without users' permission. Instagram later clarified its position in an effort to quell concerns.

Gladiators guzzled a drink made from plant ash to help their bodies recover after a hard day of sword fighting, according to Roman accounts. New tests of old bones back up that idea.

Most screening tests for colon cancer are covered by insurance. But if the results are positive, patients may require a diagnostic colonoscopy that may not be fully paid for by insurance.

Northeastern University researchers wanted to figure out how Uber comes up with surge prices by studying Manhattan and San Francisco. They say the surges work, but maybe not the way they are intended.

Donald Trump drew fire in recent debates for his lack of specifics on how he would change the country's health care system. He released a plan Wednesday that is unlikely to satisfy critics.

After he was shot, Jesus Campos yelled "Take cover!" at a hotel engineer and a guest as the Las Vegas gunman sprayed bullets into the hall. His account added detail to the timeline of events Oct. 1.

Demand is growing for more regulation to hold Facebook accountable for the misuse of millions of users' data. Noel King talks to Roger McNamee, an original investor in Facebook.

An investigation has uncovered dozens of old, seemingly delinquent political campaigns spending money long after the actual campaigning is over. Christopher O'Donnell of the Tampa Bay Times talks with NPR's Ailsa Chang about how lax regulations make it easy for former politicians to tap into campaign funds.