Sunday marks the 15th anniversary of the terror attacks in New York, Washington and Pennsylvania. We ask journalist and author Lawrence Wright to connect the post-9/11 dots from al-Qaeda to the Islamic State. We also can't think about 9/11 without remembering the so-called Axis of Evil, which included North Korea. Well, today North Korea announced that it had mastered the ability to place a nuclear warhead on a ballistic missile, after conducting its biggest nuclear test to date. Plus, we hear an appreciation of the late great ska legend Prince Buster.