John is joined by Lawrence Wright, Pulitzer Prize-winning author of “The Looming Tower: Al-Qaeda and the Road to 9/11,” to commemorate the 25th anniversary of the 2001 attacks on the World Trade Center and the Pentagon. Wright explains what we understand today about 9/11 that we didn't understand at the time, and what we still don’t know; how the war on terror waged in its aftermath changed America, the world, and us; and the terrible possibility that, in the end, Osama bin Laden achieved more of his goals than we care to admit.