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So-called Islamic State is on the run. Caught in a pincer movement in Syria and Iraq, the group has lost large swathes of territory over the past year. With its revenues and numbers of fighters also dwindling, the demise of the caliphate appears all but unavoidable. And yet many caution against writing them off too soon, pointing to the group’s proven ability to change tactics. Already, they have redirected their efforts to launching terrorist operations around the world. And their ideology is still proving an effective recruiting sergeant. Presenter: Helena Merriman Producers: Estelle Doyle and Laura Gray (Photo:Syrian soldier sets fire to an Islamic State (IS) group flag after Syrian troops regained control the previous day of al-Qaryatain Credit: JOSEPH EID/AFP/Getty Images)