National Security Analyst, ASU Professor talks border security

Peter Bergen, a CNN national security analyst and professor of practice at Arizona State University, says that 17 years after 9/11, the largest terrorist threat comes from lone-wolf attacks. He discusses what some communities are doing to prevent them, and which ones have had the most success. He talks through what leaders can do to prevent attacks without also disrupting social cohesion.

MORE: Explore other episodes of “Innovating the Future”

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The Black Church: This Is Our Story, This Is Our Song

The Black Church: This Is Our Story, This Is Our Song explores the 400-year-old story of the black church in America, the changing nature of worship spaces, and the men and women who shepherded them from the pulpit, the choir loft, and church pews.

Frontline: 'Trump's American Carnage'

Trump’s siege on his enemies, the media, and even the leaders of his own party, who for years ignored the warning signs of what was to come.

NOVA 'Forgotten Genius'

NOVA presents the remarkable life story of Percy Julian — not only one of the great African-American scientists of the 20th century, but an industrialist, self-made millionaire, humanitarian and civil rights pioneer.