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What is classified information, and who gets to decide?

A professor who once held top secret clearance explains how levels of classification work and where handling sensitive information gets tricky.
Donald Trump is famously attached to his phone. AP Photo/Matt Rourke

How to secure a smartphone for the tweeter-in-chief

The best way to protect a presidential device is to keep it off the internet altogether. If that's not going to happen, how else can such a sensitive gadget be kept safe?
Democratic U.S. presidential candidate Hillary Clinton speaks to the General Conference of the African Methodist Episcopal Church during their annual convention at the Pennsylvania Convention Center in Philadelphia, Pennsylvania, July 8, 2016. Charles Mostoller/Reuters

How did classified information get into those Hillary Clinton emails?

An academic who used to hold top secret security clearance explains how things get classified and why the Clinton email scandal is hard to nail down.

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