The government classifies millions of documents every year - secrets that can only be seen by certain people, and under certain conditions. Who decides what is secret, and what isn't? How well is the classification system working? And can a president declassify any secret, at any time, just by thinking it? 

We talk with Margaret Kwoka, law professor at Ohio State University, where she focuses on laws around government documents and access to government information. And if you want to learn more, check out our episode about security clearance. 

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