In 2013, Edward Snowden showed journalists thousands of top secret documents about U.S. intelligence agencies' surveillance efforts. He's been living in exile in Russia ever since. His new book is 'Permanent Record.'
Film critic Justin Chang reviews 'Ad Astra,' starring Brad Pitt.
Andrea Mitchell, the chief foreign affairs correspondent for NBC News and anchor of her own MSNBC show, looks back on her career in journalism. She's receiving a lifetime achievement Emmy on Sept. 24.
