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AI-generated videos of fighting between Iran and Israel went viral, and people asked chatbots if they were real. "What we're seeing is AI mediating the experience of warfare," said one researcher.

Airs Sunday, March 6, 2011 at 8:00 p.m. ET. Check your local listings.

A 6-part series exploring the biggest questions on the frontiers of science.

Airs Tuesday, December 6, 2011 at 9:00 p.m. ET/PT. Check your local listings.

The Sweet 16 weekend began Thursday night with dramatic late-night games as both men and women roll into action on Friday.

Premieres Wednesday, November 6, 2013 at 8:00 p.m. ET/PT. Check your local listings.

August 28-30, 7:00 - 11:00 p.m. and September 4-6, 2012, 8:00-11:00 p.m. ET.

Premieres Wednesday, February 6, 2013 at 8:00 p.m. ET/PT. Check your local listings.

Airs Wednesday, June 6, 2012 at 8:00 p.m. ET/PT. Check your local listings.

Coming Feb 22. Two stories: Inside the April 6th youth movement and The Muslim Brotherhood