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.
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The Durrells in Corfu returns for a fourth season of eccentric family adventures on a Greek isle in the 1930s.
From the remarkable octopus to a river of dreams, experience compelling stories of the natural world as "Nature" returns to Arizona PBS Wednesday nights at 7 p.m.
Today's most compelling personalities discover the surprising stories buried within their own families in the sixth season of the critically acclaimed PBS series "Finding Your Roots with Henry Louis Gates, Jr." The series airs Tuesdays at 7 p.m.
