HARI SREENIVASAN: But first: Can robotics and artificial intelligence help improve that rush hour commute you're facing? Experts at Carnegie Mellon University think they can by monitoring traffic flow in real time. Jeffrey Brown has the story from Pittsburgh, part of our weekly series on the Leading Edge of science and technology. JEFFREY BROWN: You know the frustration. You're late for work or to pick up your child.

JUDY WOODRUFF: The idea, how technology, music and science can inspire one another, and to the creation of distinct new sounds. Jeffrey Brown is back to take us to an unusual gathering held just a few days ago in Durham, North Carolina. JEFFREY BROWN: Start with a circuit board, add knobs and dials, solder everything together, and, eventually, if you know what you're doing, you have an instrument that can do this. Moogfest, named after inventor Robert Moog, is a celebration of the art, engineering and technology of synthesizers, machines that create sounds electronically. By night, it's a festival of different genres of music, centered on, as they call them here, synths.

JUDY WOODRUFF: Next: The promise and peril of the internet is the subject of Werner Herzog's new documentary out today. The legendary filmmaker was recently honored with an achievement award from the American Film Institute for his work in documentary film. In Washington, Jeffrey Brown caught up with Herzog to discuss the new film and more. WERNER HERZOG, Documentarian/Filmmaker: This is the birthplace of the internet. JEFFREY BROWN: In his new documentary, "Lo and Behold: Reveries of the Connected World," filmmaker Werner Herzog is again asking big questions.

JEFFREY BROWN: Five years ago, as a college freshman, Ian Burkhart dove into a wave at a North Carolina beach and broke his neck on the sandy ocean floor, leaving him paralyzed from the chest down. Now, in a medical first, he has regained some movement in his hands and fingers through technology that communicates his thoughts directly to his hand muscles. It uses a tiny chip inserted in his brain and an electronic sleeve. Burkhart has learned to perform simple tasks, even playing a guitar video game. IAN BURKHART, Spinal Injury Victim: It is just something that is so fluid.

JUDY WOODRUFF: A movie thriller being released nationally today delves into the practical, legal and moral issues surrounding drone warfare. HELEN MIRREN, Actress: We need to put a Hellfire through that roof right now. JEFFREY BROWN: It's a new kind of warfare, advanced technology that tracks, identifies, and has the power to destroy enemies by remote control from thousands of miles away. HELEN MIRREN: We have two suicide vests with explosives inside that house. JEFFREY BROWN: But as the film "Eye in the Sky" asks, should it be used?